I feel strongly that is what primaries are for and too many people ignore.... once the primary is passed it's time to support the party candidate -- in the case of PA, Santorium. However, a lot of people threatened to stay home or jump ship and it appears exactly that happened. IMO it's a very sad state of affairs we lost two excellent Senators last month, one in a race that was so close, a few more people showing up would have made a difference and a difference in the makeup of the senate.
I think we, all, are going to pay dearly for the fair weather voters.
Santorum didn't lose his base (though some of us weren't happy with him), he lost the large group of voters who don't vote along party lines.
And here in PA, those votes are hugely important.