Mitt has the Nomination All but Won, but if He Wins He Better Govern Like A Conservative

With Rick Santorum and Newt Gingrich suspending their campaigns and some of Mitt Romney's rivals such as Michele Bachmann endorsing him it is safe to say Romney is the 2012 Republican Nominee for President. He may win in November, he may not.
If he wins he should be mindful of the Tea Party that is successfully defeating sitting Republican congressman and senators out in the primary with less than conservative records. In 2010 Utah Senator Bob Bennett was defeated, this year another Utah Senator has a race on his hands, Orrin Hatch. Hatch will probably win in the end but long time Indiana Senator Richard Lugar may not be so lucky. He is trailing Tea Party challenge and Indiana state Treasurer Richard Mourdock. A Mourdock victory will turn a safe Republican seat into a leaning or likely Republican seat but he is still favored to win.
This all leads to Romney and how he will govern if elected. He does not have to be a rigid ideologue to please the Tea Party as the left would have us believe, but he does have to significantly reduce the deficit and do his absolute best to get real reforms passed. Democrats will likely filibuster most reforms but Romney must try and try hard.
If the deficit is down, regulation is streamlined and conservative judges appointed he will have no contest for the Republican Nomination in 2016 if he wins in 2012. But if the deficit does not go down significantly, and no attempts at conservative reform are made there will be a primary in 2016 and he could lose.