Consider recent comments he made in Michigan:
You know it’s very easy to excite the base with incendiary comments. We’ve seen throughout the campaign that if you’re willing to say really outrageous things that are accusative and attacking President Obama that you’re going to jump up in the polls. You know, I’m not willing to light my hair on fire to try and get support. I am who I am.Attacking President Obama is now off-limits in the Romney campaign?
Perhaps Mitt Romney's inner moderate (or even his inner progressive) is beginning to reemerge.
Romney's comment about not being accusatory sounds a lot like the Mitt Romney who ran an unsuccessful campaign against Ted Kennedy in 1994. Romney apparently didn't want to say anything outrageous back then either. He instead said he didn't want to take sides, and didn't want to hurt anyone's feelings.
Maybe, with significant primary wins under his belt going into Super Tuesday, Romney no longer feels the need to cater to conservatives. Maybe he's back to feeling safe campaigning as he has in the past - targeting the mushy middle.