Probably after Utah. I don't think he'll draw it out to the convention. He can't hate Romney that much. After all, he did endorse him in 2008.
Will Rick do that, if Mittens is short of an absolute majority due to 1) supers being out there who have not committed quite yet by the end of June, and 2) he deducts Mittens delegates from the Florida and AZ delegations on the theory that both will be made proportional? I ask, because while the odds of Mittens falling short without the cutbacks that seem highly improbable, might be 90%, with the deducts it might be as low as 60%-70%, as a wild guess (I want to see how Wisconsin tracks the Sean Trende model after the fall-off in LA before upping the odds).