Geraghty the Indispensable has his Obi Wan, and I have George Smiley  --quiet, experienced, trusted by senior GOPers, very competent, back in the lists.  He writes that the voter fraud issues are serious:

Voter fraud by the leftwing group ACORN has already been reported in Missouri and new more egregious cases are being reported in Pennsylvania.

Dozens of voters in the traditionally GOP counties of Lancaster and Lebanon are saying that after they have cast their ballot for Republican candidates their votes are being registered for the Democrat candidate

He's also worried about the talking heads missing the obvious problem with any exit polling:  "Important note about the exit polls, they do NOT include ABSENTEE or EARLY VOTERS. This will be a factor in exit polls for states like TN, FL, AZ, and CA."

He sent along a link to a relevant YouTube video, but I can't open it.