Rick Santorum three weeks ago said that party outsiders shouldn't have the chance to vote in primaries, via CNN:

"We want the activists of the party, the people who make up the backbone of the Republican Party to have a say in who our nominee is as opposed to a bunch of people who don't even identify themselves as Republicans picking our nominee," Santorum told voters on the call held January 29. "I don't like that. I believe that states should only allow Republicans to vote in Republican primaries."

In stark contrast to his campaign's more recent courtship of Democrats, in January Santorum told Democrats that if they wanted to vote for a Republican, they should switch their party affiliation.

"It's the Republican nomination, not the independent nomination or the Democratic nomination," he said on the call. "If you're a Democrat and you want to be a Democrat, then vote in the Democratic primary, not the Republican. If you want to vote in the Republican Party then become one."