D+3 or 4 is the likely national turnout.
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It's a conceivable turnout, but certainly not likely. I'd say that's definitely a best-case scenario for Dems.
Gallup did thousands of surveys to come up with its likely voter model for 2012 and it the breakdown will be:
36R/35D/29I.
Rasmussen has it at D+2.
I'll be very suprised, given the intensity gap if it isn't even or maybe +1 either way - I'd bet +1R.
Hank