His tweet said 91%. Ive offered to bet him using his odds, never a response though. He demanded an even money bet from Joe Scarborough.
Well, I didn't see Nate Silver's tweet, but I did see this article posted at FR:
NATE SILVER: Obama's Odds Of Winning Have Now Hit An Overwhelming 86%
If he's now upped it to 91%, he's beyond delusional. It's time for the rubber room.