A president can't repeal Obamacare. The Congress will have to pass legislation for there to be a full repeal of Obamacare, then the president would have to sign it.
So the question for Republican candidates is: would they sign a bill to repeal Obamacare?
The real fight to repeal Obamacare is in electing more Republicans to Congress and especially the Senate. Things can probably be done by a president or Congress to cripple or slow down Obamacare, but the only way for a full repeal is a bill from Congress that is signed by the president.
And, as a symbolic gesture, the new House did pass a bill to repeal Obamacare earlier this year. Of course, it went nowhere in the Senate.
Obamacare has to be repealed the same way it was passed.
I do not think we will have a fillibuster-proof majority in the Senate. Therefore, you NEED a POTUS who will strongly advocate for repeal and twist a few blue-dog arms into supporting the repeal.
Romney is only talking about waivers granted by the executive branch....not enough to stop the goliath.
Perry, Bachmann, Cain, Gingrich and Santorum would all advocate a repeal and fight for it in Congress.
Romney and Huntsman would not.
So, what are we doing? Allowing Romney and Huntsman to slide through while we play circular firing squad!!!!!
Perry is imperfect and his own worst enemy, but Romney is the real threat!
There is NO Republican currently running who wouldn't sign the bill to repeal ObamaCare so this shouldn't even be an issue. If a Republican congress passes the repeal (and I am sure they would) then all of the candidates currently running would, as President, sign that repeal.
You'll have to revolutionize the GOP congressional leadership -- as I just pointed out, the Republican Establishment is committed to preserving Obamacare, for the benefit of their corporate and Old Money audience.