UNDECIDED….Conventional wisdom suggests that undecided voters usually break for the challenger in a presidential race. As Ryan Lizza puts it:

If these voters haven’t decided to support the guy they know best, the theory goes, there must be a reason they are holding out and will therefore end up supporting the challenger if he or she is an acceptable alternative.

Ryan then goes on to report on a recent poll suggesting that this is true in spades this year: undecided voters in battleground states are very unhappy with George Bush and seem likely to break decisively for Kerry over the next couple of months. Go read.