Ben Domenech thinks 2012 could be an "undertow" election. Not an election where a wave of enthusiasm carries one candidate to victory, but instead when a lack of enthusiasm drops the bottom out from under one candidate.
In an undertow, potential voters still like a candidate when asked by pollsters, but not enough to make the effort to vote for him. Polls don't always reflect this demotivation. See the RealClearPolitics article for an explanation.
