[cnn-photo-caption image= http://i.l.cnn.net/cnn/2008/POLITICS/02/26/schneider.poll/art.mccain.obama.gi.jpg caption=" New national polls show Sen. Barack Obama, right, trumping Sen. John McCain in November."]WASHINGTON (CNN) - Three national polls of Democrats show Sen. Barack Obama is the front-runner for the nomination. But what's behind this latest momentum?
There's growing evidence that Obama is seen as more electable than Sen. Hillary Clinton.
If you average the "poll of polls" - AP-IPSOS, USA Today/Gallup and CBS/New York Times - Obama leads Clinton 50 percent to 40 percent, with 10 percent unsure.