BTW, you should know that, at this point, the election is basically over and Clinton has won. This election is far too polarizing for the kind of swing Trump would need to win (people who still have hope for Trump are basically hoping for a Brexit scenario where polls significantly underestimate his support). So their strategy worked, even if it was risky.
I actually think that Clinton was the best choice against Trump because she is so thoroughly vetted. There's effectively nothing that could come out that we don't already know. Any other candidate could have a myriad of skeletons in their closets that would only come out with well resourced oppo. That's not even including Sanders' proposals that would result in a decent tax hike on middle class families. Republicans would have pushed that HARD and you have no idea how that would have been received.