Rubio, a first-term Republican senator and Cuban-American, hopes to bypass a second term in the Senate to pursue the presidency and become the first Hispanic president.

"Every time he has run, he has come from behind and won," WFTV political analyst Rick Foglesong said.

Rubio has a political action committee ready to raise and spend unlimited cash for his campaign.

From even his most enthusiastic supporters, Rubio can accept only $2,700 to help him win the nomination. But the pro-Rubio independent Conservative Solutions PAC will face no such limits when it starts operations on Thursday.

More trending stories

Foglesong said that despite his first victory, Rubio has yet to prove he is a leader, citing his failed immigration reform bill.

"Tea party opposition to that caused him to fold his tent," Foglesong said.

Rubio is being compared to another Florida politician, Jeb Bush, who some have speculated will also run for president. Although Rubio might not have the Republican establishment that Bush has, Foglesong said the senator has proven to have an advantage with the public.

"He is acceptable according to public opinion polls right now to the most broad cross-section of the party," Foglesong said.

Rubio is the third Republican to delcare candidacy, but the only one from Florida.