Mitt can run, but if he's the GOP candidate, the Democrats will win again. His stand on the 2nd Amendment (and health care, "Homeland Security", taxes, and the role of government) makes him unacceptable. His legislation in Massachusetts, coupled with his answers in the second debate last time, decided it for me.
I voted for Gary Johnson. I could not pull the lever a man that wants to strip me of my liberties. The "lesser of the two evils" argument would not sell with me and with enough other conservatives and libertarians that Pr. Obama won a second term. Remember Paul Ryan? Remember the energy he brought? Even that couldn't carry Romney to the finish line.
There's two years to find a candidate. Gary Johnson is running again. Read his platform and ask yourself if you don't support his beliefs and ideas more than every candidate you ever supported for the Presidency.
So here's my hill on this issue. If the Republicans can do no better than Mitt Romney in 2016, they will have to convince someone else to vote for him. If they can get beyond themselves and consider a candidate that shares at least some of my values, I will reconsider.