90 minutes after Clinton left the ceremony b) reporters — or even a reporter — were not allowed to follow her and c) the temperature in New York City at the time of Clinton's overheating was in the low 80s. (A heat wave over the eastern United States broke last night/this morning.)

She later left her daughter's apartment, saying she was "feeling great" and waving at the crowd, per the Associated Press.

Whether Clinton likes it or not, her "overheating" episode comes at a very bad time for her campaign. Thanks to the likes of Rudy Giuliani and a small but vocal element of the Republican base, talk of her health had been bubbling over the past week — triggered by a coughing episode she experienced during a Labor Day rally.

That talk was largely confined to Republicans convinced that Clinton has long been hiding some sort of serious illness. I wrote dismissively of that conspiracy theory in this space last week, noting that Clinton had been given an entirely clean bill of health by her doctors after an episode in which she fainted, suffered a concussion and then was found to have a blood clot in late 2012 and early 2013.

Coughing, I wrote, is simply not evidence enough of any sort of major illness that Clinton is assumed to be hiding. Neither, of course, is feeling "overheated." But those two things happening within six days of each other to a candidate who is 68 years old makes talk of Clinton's health no longer just the stuff of conspiracy theorists.

Whereas Clinton and her campaign could laugh off questions about her health before today, the "overheating" episode makes it almost impossible for them to do so.