Problem is, 80% of the voters who vote Republican are going to keep on voting Republican even if they ran Adolph Hitler at the top of the ticket and Joseph Stalin for VP. Anyone who is still voting for that party after all these years is so thoroughly drowned in the Koolaide that nothing will ever change their vote.
So you know Trump is pulling at least 40% of the popular this fall no matter what, just as 40% of the voters will be voting Hillary no matter what. Then there's always that 5% range of people who are true independents, and about another 10 or 15% who are generally straight ticket voters when they do vote, but don't necessarily vote every election because they're not always very motivated. They'll sometimes sit one out if they aren't excited about either candidate, and with the general disgust about both Hillary and Trump, quite a lot of those voters would probably not have bothered this year.
I mean, let's face it - even a lot of us who really are into politics were already practically vomiting into trash cans at the idea of having to choose between one of those two, so you know that a lot of people who aren't very politically motivated probably would have just said, "fuck it. what's on TV that night?" And, a lot of them still will. But this is the sort of issue that is going to pry a lot of those people out of their houses and get them out into the voting booth - however, the question is, how many will be motivated because they are disgusted by what the republicans are doing, or because they support it?
My guess is that it's going to motivate more liberals than conservatives, which should make Hillary's victory an easier one, but more importantly that it will swing several Senate seats to the Blue column. I'm not entirely confident that it will be enough, though - picking up 5 seats out of 24 is going to be tougher than it sounds. Quite a lot of those Republican seats that are contested this year are in solid Red states, and it may be hard. It's going to be one hell of an interesting night in November.