I suspect he will stick with his debate tone for the rest of the election, and give Arnold a pass -- tacitly allowing the late bleed-off of some of his support to Arnold.
Just a guess because obviously I have no idea what is in McClintock's mind...but regardless, I don't think that McClintock remaining in the race will necessarily throw the race to Busta. It could, sure, but the liklihood from tonight is that Arnold will win anyway, albeit a close race, because the unions will ensure that Democrats get as much of their base out as will tolerate Busta -- which isn't all of it, for sure.