considering that undecideds typically break in favor of the challenger...
John Kerry would like to talk to you.
As would Michael Dukakis, Walter Mondale, and George McGovern.
"Typically." Undecideds broke for Ford in 1976, Reagan in 1980, Clinton in 1992, and Dole in 1996. Not to mention the many races not for president... the only recent major examples I remember of this not being the case is NV-Sen 2010 and IL-Gov 2010. And that's because the two challengers were crazy. I suspect that most who are undecided right now aren't enthused with Romney, but are weary of voting for Obama again. I think that the former will win out.