Of course it's reasonable and I bet many if not most will vote for Santorum. The problem is much more on the right where some are saying "No way will I vote for Santorum since he didn't campaign for Tomey" which would have been an unprecedented move for a junior senator of the same party to undermine his senior senator like that. Some also point to whatever spending Santorum has voted for to claim he's some sort of closet liberal despite his 90% ratings on his voting record from every conservative watchdog group out there. Santorum is easily the most conservative Senator but still some of these boobs amongst us want to sit on their hands and not vote for him.