I agree. If he seriously wanted Obama out he would run as a democrat.
That's what I've been saying all along. It would pretty much guarantee a clean 1-on-1 matchup where winning is less of a concern than the amount of damage you do to the incumbent.
If Romney would ever have gotten over his pipe dreams of being the GOP nominee, he could have done the same thing -- he and Obama could congratulate each other on government-mandated health care, bailouts, illegal immigration, homosexual "rights", and abortion support, and just have a slap fight over taxation.
If Mitt gets the nod, I'll vote for Trump. No. Way. I. Vote. For. Mitt.