We can also speculate about what crossover means. Here in the 7th district there are a lot of union republicans. When I was AFL-CIO I didn’t vote democrat. My neighbors are both union members and are rock ribbed conservatives.
There is also a growing conservative UAW group in Michigan who do more than talk the talk. The head of the group (Terry Bowman) testified against union political fundraising on capitol hill just a few weeks back.
http://www.michigancapitolconfidential.com/16292
We can also speculate about what crossover means.
Yep, speculation can be made about most anything or process. But Santorum spent time/effort to try to get traditional democrat voters to cross over and play the spoiler role for him. I doubt the number is very high but it would be interesting to know, imo.