On the positive side, maybe he’ll siphon primary votes from Christie. The more ‘moderates’ in the race to divide the moderate vote, the better.
But more importantly, conservatives need to settle on one conservative candidate before the primaries start and insist that other pretenders stand aside. We cannot go into the 2016 primary season with 3 or 4 conservatives each polling 5-20%. By April, when the Santorums of the world drop out (and Santorum in a fine man who just stubbornly stuck it out long enough to ensure Romney’s nomination), the media and the GOP establishment will be crowning Christie as the nominee.
So Run Scott, Run! And even if you’re just at 3% in the polls, you hold onto those 3% moderates all the way to the convention.