Ezra Klein has written a fair-minded appraisal of Mitt Romney for Bloomberg View which closes on the following note:
At this point, neither voters nor Romney have sufficient data to know how he would govern. With a Republican Congress, he would govern from the right. With a Democratic Congress, he would move to the center. If he faces a divided Congress, he will look for compromise to get “the best possible thing done.” Without knowing the composition of Congress, we can’t know the kind of president Romney would be. We know he can manage, but we don’t know which company he will be managing.
Given that the U.S. Senate is extremely likely to have a Democratic majority, I think it is fair to say that a Romney administration would have little choice but to govern from the center. Indeed, one wonders if the the first years of the Obama administration might have turned out very differently had the U.S. Senate been more evenly divided between Democrats and Republicans.