Republicans have a better chance at defeating President Obama if the party nominates a "moderate" candidate, according to a new survey.

The Public Policy Polling survey was the second poll released Wednesday to show Obama tied with a generic Republican nominee if the election were held now.

The PPP survey had the president level at 47 percent with his unnamed challenger, and a Gallup survey had Obama tied at 45 percent with his challenger. The results become more nuanced if respondents are given ideological qualifiers about the GOP nominee.

In the PPP survey, a generic moderate Republican candidate has a 2-point lead over Obama, 46 to 44 percent. But when the 600 registered voters were asked whether they'd back Obama or a Tea Party conservative, the president led by 4 points, 49 to 45 percent.

Overall, Obama leads all his identified potential rivals by at least 3 points.

The PPP survey was conducted Feb. 11-14 and had a margin of error of plus or minus 4 percent.