Bottom line is that opposition to neither global warming nor an individual health care mandate started out as some kind of core, biblical, conservative principle. Over time the movement has more or less found a consensus on them, but it is reasonable to assume that a thinking individual would mull them over and study them for a while before drawing final conclusions. There is no reason to doubt that Newt will stick to what his stated positions on those issues are in the campaign when he is elected into office.
And there is no reason to have ANY confidence that Mitt Romney will do likewise.