For most potential candidates, even those who are almost certain to run, like Romney and Pawlenty, the answer to "Are you going to run for president in 2012?" is "I'm just focused on my current job" or "I'm focused on getting Republicans elected in 2010. It's way too early to talk about 2012."
Santorum, though, is taking the opposite track. Just in case his trips to Iowa and South Carolina weren't enough to telegraph his intentions, this is like the third time he's publicly said something like "Yes, I'm thinking about running":
linkWill Santorum break Biden's record for number of times to announce your candidacy in the same electoral cycle?