If the Republican Party nominates Romney, it is the Republican Party that Obama will owe thanks to.
If Republicans would rather have an extreme liberal over a soft Republican, then they IMO give up their right to bitch and moan. Is Romney my top pick? No. I personally like the sound of a Santorum/Gingrich ticket. This does not mean I will lose motivation to get Obama out of office if Romney gets the nod. My goal, as it should be with all republicans, is to replace Obama. Any of the field is more acutely fitted to fill the job of President than Obama, even the weakest among them.