Grab your salt-shakers people, but pay attention, too. We’ve got hold of a polling memo being sent around to supporters by David Perdue, the U.S. Senate candidate in a GOP runoff with Jack Kingston.

You have every right to your skepticism, but you can also bet this is what the Fortune 500 exec is telling potential donors over the phone – what with a June 30 fund-raising deadline approaching.

The data come from a live voice poll conducted on Sunday, Monday and Tuesday of this week – 600 GOP voters, MOE of +/-4.0 percentage points.

The memo contains two basic messages that Perdue is attempting to push out: One, that a barrage TV criticism from pro-Kingston groups hasn’t wounded him. The first-time candidate’s approval ranking still sits at a 63 percent, with 19 percent of voters rating him unfavorably.

Secondly, the race is closer than other polls have indicated. Those have given Kingston a double-digit lead. Perdue’s survey – conducted by a firm he’s paying, remember – has the two candidates in a virtual tie: Perdue, 45 percent, and Kingston, 44 percent.

Read and absorb here: