“Did Rove project Mitt the likely winner yet?”
Yes he did, just a couple days ago.
If the Ds from 08 had been dropped off roll in the primaries and shown up as "Us" then I think we should expect to see an increase in Us as Ds swelled their ranks. We have no evidence of that.
Second, by all polls, those Us will vote R at a 10-15% higher rate Han they will D.
Finally, most polls show that SOME Ds will vote for R at a 5-7% higher rate than Rs will vote D.