Rick Santorum is now being hit in ads by both Mitt Romney and Ron Paul, as Paul has unveiled a new attack that blasts Santorum's voting record in Congress, labeling the former Pennsylvania Senator a "fake" conservative.

"The truth about Rick Santorum's conservative credentials," said the Paul campaign as they rolled out the new ad.

Here's the ad:

In a sense, you could argue that Paul's attacks on Santorum might help Romney more than anyone else.

Paul is planning several days of campaign stops in Michigan before the primary there next week - it's a state where Romney has been behind Santorum in the polls.

The Paul campaign will not only run this ad in Michigan, but also in some Super Tuesday states as well.

Will it knock Santorum down a few notches?