Read the full Pew Research Center poll.

Rudy Giuliani’s once solid lead among Republicans nationwide has vanished, and John McCain — whose campaign was regarded as dead in the water this summer — is back on top with the GOP leaders. McCain has 22 percent support among Republicans, followed by Giuliani at 20 percent and Mike Huckabee at 17 percent. Mitt Romney follows at 12 percent with Fred Thompson at 19 percent. The survey was conducted Dec. 19-30 and has a 5 percent margin of error.

Giuliani was counting on the 21 states that vote Feb. 5, but the poll indicates he is in a virtual tie with McCain in those states.

On the Democratic side, Hillary Clinton maintains her large national lead over Barack Obama, 46 percent to 26 percent, with John Edwards at 14 percent.