Say, didn't Romney once cross over to vote in a Democratic primary?

The Romney campaign has been denouncing Democratic efforts – and now those by Rick Santorum – to get Democrats to vote in Michigan’s open primary…

Yet Romney himself gave a similar explanation in his last presidential run for why he crossover voted in in the 1990s in Massachusetts, per this ABC News clip…

Romney spokeswoman Andrea Saul emails it’s “no comparison at all. This is a blatant effort by Rick Santorum to join forces with President Obama and his supporters to encourage Democrats to vote in the Republican primary.”