I’m pretty sure when Arlen Specter flipped parties, he didn’t expect to see headlines like this on in the Christian Science Monitor as early as July:

Are Specter’s Senate days numbered?

The answer, of course, is yes, as is every senator’s. The real question is, “what is that number?” Specter’s final day in the Senate could be prompted by Joe Sestak in the primary, Pat Toomey in the general, or retirement six years from now.