I don't buy it either JPat.
To my way of thinking, it's not really all that difficult to explain the apparent fickleness.
The GOP establishment is trying to force-feed Romney. The GOP electorate is desperate to find a true conservative to beat Romney and run against Obama. Each of the "true conservatives" have had their moment in the spotlight, and have either failed the vetting process, or harmed their credibility enough for voters to explore another candidate. The debate performances, straw-polls, and stump-speeches have been prime movers of public opinion, fueled like never before by the Internet, the never-more-instant availability of video, and online punditocracy.
I'm not surprised at all that the conservative "Not-Romney's" are each getting a turn in the spotlight. The scary part is there's not a lot of depth, which means we'll see if the electorate determines that none of them are sufficient to beat Romney and Obama. Romney may emerge by attrition.