GOP Sabotage?

A reader writes:

So I'm at lunch today with coworkers, here in Columbus, Ohio, and the primaries of course are the hot topic of discussion. The group, mostly conservative, Republican leaning White Anglo-Saxon Protestants, agrees across the board they will be voting for a Democrat tomorrow because McCain is a lock in our collective opinion for the GOP nomination. 

Now what shocked me was how many of the group (a majority in fact) are voting for Hillary because they like McCain's chances this fall against her better than against Obama. In fact as I prod more, they to a man admit they'd rather see Obama in the White House than Clinton, but ultimately their allegiance is to McCain, hence the vote for Clinton.

The McCainiacs are trying to select his weakest opponent. Makes perfect sense from their point of view.