No doubt Kagan leaked to the Obama administration that Roberts was the weak link on the conservative side oherwise they would have went after Kennedy. I doubt this was a month long issue. I bet Roberts changed his mind over the last week.
The annoying thing about all this is that it will be tossed around here and maybe on Fox News for a week or two and then it will make way for other news and we will never know why Roberts made the decision he did.
All we can do is hope for Romney to win and to gain the Senate and also hope Romney appoints conservatives which he will surely get the chance to do in the next 8 years.