The survey shows Democrat Michelle Nunn leading, by slim margins, all prospective Republican nominees for a six-year term.
With a reported margin of error slightly over 3 percentage points, Nunn's leads in the poll make any possible November contest a dead heat, at this point.
Nunn leads Paul Brown, 42-41; Jack Kingston, 44-42; Karen Handel, 44-40 and Phil Gingrey, 45-41.
"Nunn has her party lined up strongly behind her, getting more than 80 percent of the Democratic vote in each match up," according to PPP. "Meanwhile, Republicans are less united because of their large primary field, with each of their possible candidates only in the 70s with their party base."
Nunn, 48, is the daughter of former U.S. Sen. Sam Nunn, who served as a Democrat in the Senate from 1972-1997. He was a powerful member of the body, serving as chairman of the Senate Armed Services Committee.
She has good a good relationship with several influential Republicans. As head of Points of Light, she has a particularly good working relationship with former President George H.W. Bush.