A lot of candidates who are typically safe just bank their money over years and years and years - as McCain has done - allowing for a rather substantial emergency reserve.
The fact that he feels compelled to deplete nearly all of his reserves speaks volumes about what internal polling must be telling them after the first two debates.
I hope his internal polling is not good, although I’m not sure he’ll care. I’ve always had this feeling with McCain that his presidential candidacy and even this candidacy were just some strange expression of an elderly gentleman’s vanity.
If he really cared, he wouldn’t run...but he doesn’t care.