ABC reports:

Rick Santorum played off of the Mitt Romney campaign’s Etch A Sketch gaffe today when he told an audience that the country might be better off with President Obama than with a candidate who will shift his positions with ease and who he believes is not very different from the president. “You win by giving people a choice. You win by giving people the opportunity to see a different vision for our country, not someone who’s just going to be a little different than the person in there. If you’re going to be a little different, we might as well stay with what we have instead of taking a risk with what may be the Etch A Sketch candidate of the future,” Santorum told a crowd at USAA.

Mitt's response: ""I was disappointed to hear that Rick Santorum would rather have Barack Obama as president than a Republican." This jumping on gaffes game works both ways.