On Monday’s Today show, NBC reporter Andrea Mitchell was really crunching the sub-group numbers before the Pennyslvania primary:

A new MSNBC/McClatchy poll shows Clinton ahead by five, but eight percent were undecided and they tend to favor Clinton. And in a state where Obama bowled a 37 at a photo opportunity Clinton has a big lead, 21 points among bowlers and a 25-point lead among gun owners. She and Obama were evenly split among beer drinkers, 44 to 44.

The viewer at home must wonder at which point all this seems like double- and triple-dipping in the polls. Aren’t there a number of voters who match all these, and are beer-drinking bowlers with guns?