Here's John McCain this morning on Fox News, riffing on why he thinks Hillary Clinton took responsibility last night for security in Libya.
"There are many people that believe that Secretary Clinton may have further political ambitions, and this could obviously harm that in one way, but also bring in some additional support -- possibly, from President Obama who can't run again."
Considering their friendship, it's notable that McCain aired the idea that Hillary might be doing this to further her political prospects. I'd think he wouldn't publicly suggest that more cynical interpretation.
Having said that, he also called it "laudable" that she would "throw herself under the bus" and suggested "loyalty" might have also motivated her decision.