Gallup has been polling voters daily and its Jan. 23-25 survey has John McCain atop the Republican field nationally, at 30 percent, with Mitt Romney moving up in the ranks to draw even with Mike Huckabee at 20 percent. Rudy Giuliani is at 13 percent and Ron Paul at 5 percent.

On the Democratic side, where things could change depending on today’s South Carolina outcome, Hillary Clinton has a 47 percent to 32 percent lead nationally over Barack Obama with John Edwards at 11 percent. Nationally, Obama leads Clinton by about 2-to-1 among blacks, and Clinton leads Obama by 20 points among whites.

On the economy, Gallup says 22 percent of Americans rate current economic conditions as “excellent” or “good,” while 46 percent call them “only fair,” and 3 percent “poor.”