WASHINGTON—The 112th Congress has been perhaps the most unpopular in the history of the institution, with an approval rating hovering near 10 percent for much of the term.

But in the U.S. House, the body closest to the passions of the people, a mass ejection of incumbents does not appear imminent.

Of Georgia's 13 incumbent members, six face primary challenges in Tuesday's vote. None of the races is likely to be close. In the general election only one incumbent -- Augusta Democrat John Barrow, in a district redrawn to favor Republicans -- is in real danger at this point.

Nationally, forecasters expect the House to remain under Republican control with a swing of just a few seats one way or the other.

"Just because congressional job approval is at an all-time low doesn't mean that all incumbents are going to be thrown out of office," said Stuart Rothenberg, a veteran congressional campaign analyst and publisher of the non-partisan Rothenberg Political Report.

"Voters need a credible alternative, even when they're angry. And in these races a credible alternative hasn't come to the surface."

The primary hurdle to be a credible alternative is money, and campaign finance reports show challengers in Tuesday's contests at a severe disadvantage in that department.

Atlanta Democrat John Lewis had more than $400,000 in his campaign bank account earlier this month, compared with challenger Michael Johnson's $7,000. To the northwest, Marietta Republican Rep. Phil Gingrey had $1.74 million on hand against William Llop's mostly self-loaned $69,000 and Michael Opitz's $946. The same trend played out across other Georgia races.

"These elections aren't all about money, but you have to have money to introduce yourself to voters," Rothenberg said. "You can be the best candidate in the world with the best message and the best-looking family, but if you don't have money to run ads, do direct mail and introduce yourself, you're not going to win."

Also when it comes to primary challenges, Georgia has some of the most liberal and conservative members of Congress, making it difficult to wage an ideological contest.

"We've got [Democrats] John Lewis and Hank Johnson [on the left] and at the far right -- it's hard to get to the right of [Republicans] Paul Broun and Tom Graves," said University of Georgia political science professor Charles Bullock. "And so one of the interpretations of serious challengers for Graves and Broun is they look at those districts and say: 'Those guys are good matches for those districts. There's not much I can do.'"

The districts were reinforced last year through decennial redistricting. The politically charged process has been credited — or blamed — for keeping incumbents entrenched and creating more ideologically uniform districts.

In Georgia Republicans controlled the process and used it to protect their sitting members, create a new Republican-heavy district based in Hall County and make Barrow's terrain significantly more difficult.

The result was a lack of high-profile challenges — or any challenge at all. Freshman Republican Rep. Austin Scott of Tifton narrowly knocked off Democratic incumbent Jim Marshall in 2010. This year in a safely Republican district Scott does not have any qualified challengers from either party.

Coweta County Rep. Lynn Westmoreland took the lead for House Republicans' campaign arm in a nationwide redistricting effort that Westmoreland said is a major factor in Republicans likely holding the House. Westmoreland said as early as late 2008 he and his allies were identifying important state house seats to give the GOP control of legislatures and, thus, redistricting.

As a result Republicans took complete control of the redisctricting process for more than 200 U.S. House seats after the 2010 election, allowing them to protect and consolidate the gains of the GOP wave. Still, Westmoreland said, there is some upheaval involved.

"I've got a primary — I've got 2 opponents," Westmoreland said. "Typically after redistricting you do have more contested races or primaries because you've got new districts."

But contested does not always mean competitive.

"There's that old saying that you can't beat somebody with nobody," Bullock said. "To the extent that there are people coming forward to challenge these incumbents, a lot of them are nobodies."

3rd District Republicans

Chip Flanegan

AGE: 54

HOME: Henry County

EDUCATION: Forest Park High School graduate, studied for two years at the Baptist University of America

OCCUPATION: owner of Jonesboro Rental Center

POL EXPERIENCE: Ran unsuccessfully for Congress in 13th district in 2010

FAMILY: married nine years to Maria, two children

WEBSITE: http://www.chipflanegan.com

Kent Kingsley

AGE: 60

HOME: Milner

EDUCATION: Bachelor's degree from Fort Valley State College, master's from Mississippi State University

OCCUPATION: Broker/owner/realtor at Traditions Realty

POL EXPERIENCE: Lamar County Commission chairman, 1998-2002

FAMILY: married 41 years to Joy, two children

WEBSITE: http://kingsleyforcongress.com/

Lynn Westmoreland

AGE: 62

HOME: Coweta County

EDUCATION: attended Georgia State University but did not graduate, graduated Therrell High School

OCCUPATION: Member of Congress, former building company owner

POLITICAL EXPERIENCE: U.S. House, 2005-present; Georgia state house, 1993-2005

FAMILY: married 43 years to Joan, three children

WEBSITE: http://www.lynnwestmoreland.org/

Fourth District

Democrats

Hank Johnson Jr.

AGE: 57

HOME: Lithonia

EDUCATION: Juris Doctorate, Texas Southern University; Bachelor's, Clark College

OCCUPATION: Member of Congress, former attorney

POLITICAL EXPERIENCE: U.S. Congress, 2007-present; DeKalb County Commissioner, 2001-2006; DeKalb County Magistrate Court Judge, 1989-2000.

FAMILY: Married 32 years to Mereda, two children.

WEBSITE: www.hankforcongress.com

Courtney L. Dillard Sr.

AGE: 49

HOME: Conyers

EDUCATION: Bachelor's, Luther Rice University & Seminary; Master of Business Administration candidate, Liberty University

OCCUPATION: Real estate developer, small business owner

POLITICAL EXPERIENCE: Rockdale County Democratic Party leader, at-large post holder; unsuccessful campaign for Rockdale County Commissioner, 2010.

FAMILY: Married 24 years to Gayla, five children

WEBSITE: www.courtneydillard.com

Lincoln Nunnally

AGE: 32

HOME: Porterdale

EDUCATION: Bachelor's, Palm Beach Atlantic University.

OCCUPATION: Business Consultant

POLITICAL EXPERIENCE: None

FAMILY: Married to Rebekah; one child

WEBSITE: lincoln-nunnally.com

Republicans

Greg Pallen

AGE: 43

HOME: Oxford

EDUCATION: Bachelor's, University of Georgia.

OCCUPATION: President of Pallen Enterprises Inc.

POLITICAL EXPERIENCE: None

FAMILY: Single

WEBSITE: www.gregpallenforcongress.com

J. Chris Vaughn

AGE: 46

HOME: Conyers

EDUCATION: Attended Gaston College

OCCUPATION: Minister, public speaker

POLITICAL EXPERIENCE: None

FAMILY: Married 24 years to Lisa; three children

WEBSITE: www.chrisvaughnforcongress.com

Fifth District Democrats

John Robert Lewis

AGE: 72

HOME: Atlanta

EDUCATION: Bachelor's, Fisk University; Associate Degree, American Baptist Theological Seminary.

OCCUPATION: Member of Congress, longtime civil rights activist

POLITICAL EXPERIENCE: U.S. House, 1987-present; Atlanta city councilman, 1982-1986

FAMILY: Married 43 years to Lillian Miles, one child

WEBSITE: www.johnlewisforcongress.com

Michael Johnson

AGE: 44

HOME: Atlanta

EDUCATION: Juris Doctorate, Syracuse University College of Law; Bachelor's, Morehouse College.

OCCUPATION: Former Fulton County Superior Court judge

POLITICAL EXPERIENCE: Elected Fulton County Superior Court judge, 2005-2012

FAMILY: Married 13 years to Alison, two children

WEBSITE: www.michaeljohnsonforcongress.com

Sixth District Democrats

Robert Montigel

AGE: 65

HOME: Alpharetta

EDUCATION: Master in Business Administration, Columbia University; bachelor's, Lehigh University

OCCUPATION: Owner, Biggs Building Products

POLITICAL EXPERIENCE: None.

FAMILY: married to Maryann for 41 years, two children

WEBSITE: http://www.montigelforcongress.com/

Jeff Kazanow

AGE: 57

HOME: Roswell

EDUCATION: Master in Business Administration and bachelor's degrees from Michigan State University

OCCUPATION: Business consultant

POLITICAL EXPERIENCE: None

FAMILY: widower, two children

WEBSITE: http://www.kazanowforcongress.com/

Seventh District Republicans

David Hancock

AGE: 51

HOME: Suwanee

EDUCATION: Bachelor's, Auburn University

OCCUPATION: Software engineer/business owner

POL EXPERIENCE: Unsuccessful run for state house, 2008

FAMILY: Married to Darlene, two children

WEBSITE: www.hancock2012.com

Rob Woodall

AGE: 42

HOME: Lawrenceville

EDUCATION: Juris Doctorate from University of Georgia Law School; bachelor's from Furman University

OCCUPATION: Member of Congress, former congressional staffer to Rep. John Linder

POLITICAL EXPERIENCE: U.S. House, 2011-present

FAMILY: Single

WEBSITE http://robwoodall.com/

Ninth District Republicans

Doug Collins

AGE: 45

HOME: Gainesville

EDUCATION: Juris Doctorate from John Marshall Law School, bachelor's from North Georgia College & State University

OCCUPATION: Attorney, Air Force Reserves chaplain

POL EXPERIENCE: State House 2007-present

FAMILY: married 23 years to Lisa; three children

WEBSITE: http://collinsleads.com

Martha Zoller

AGE: 52

HOME: Gainesville

EDUCATION: Bachelor's from University of Georgia

OCCUPATION: Talk radio host

POL EXPERIENCE: None

FAMILY: Married 22 years to Linwood, three children

WEBSITE: http://marthaforcongress.com

Roger Fitzpatrick

AGE: 52

HOME: Cleveland

EDUCATION: Master's from North Georgia College, bachelor's from University of Georgia

OCCUPATION: Retired teacher and principal

POL EXPERIENCE: None

FAMILY: Married 26 years to Linda, three children

WEBSITE: http://www.fitzpatrick4congress.com/

10th District

Paul Broun

AGE: 66

HOME: Athens

EDUCATION: Medical degree from the Medical College of Georgia, bachelor's from University of Georgia

OCCUPATION: Member of Congress, general practice physician

POLITICAL EXPERIENCE: U.S. House 2007-present

FAMILY: Married 27 years to Niki, three children

WEBSITE: www.paulbroun.com

Stephen Simpson

AGE: 61

HOME: Milledgeville

EDUCATION: Master's in business administration from Mercer University, bachelor's from Georgia College and State University

OCCUPATION: Banker, retired military officer

POLITICAL EXPERIENCE: None

FAMILY: Married 39 years to Susan, two children

WEBSITE: http://www.stephensimpson2012.com

11th District Republicans

William Llop

AGE: 53

HOME: Sandy Springs

EDUCATION: Bachelor's from Mercer University

OCCUPATION: Certified Public Accountant

POL EXPERIENCE: None

FAMILY: married 12 years to Mary Lynn; two children

WEBSITE: http://www.williamllopcpaforcongress.com/

Michael Opitz

AGE: 66

HOME: Marietta

EDUCATION: Master's degree in psychology from the University of West Georgia, bachelor's from Auburn University

OCCUPATION: retired from Lucent Technologies/AT&T, mediator and arbitrator

POLITICAL EXPERIENCE: Brief run for Congress in 1994, pulled out before qualifying

FAMILY: married to Becky for 33 years, three children

WEBSITE: http://www.opitzforcongress.org/

Phil Gingrey

Age: 70

HOME: Marietta

EDUCATION: Medical degree from Medical College of Georgia, bachelor's from Georgia Tech

OCCUPATION: Member of Congress, obstetrician/gynecologist

POLITICAL EXPERIENCE: U.S. House 2003-present, state Senate 1999-2003

FAMILY: Married 42 years to Billie, four children

WEBSITE: www.gingrey.com

—biographical information compiled by Daniel Malloy, Jeremy Redmon and Aaron Gould Sheinin