This is a common misconception. Look at how much stuff has come out from Trump's past. You probably thought Trump went through lots of vetting in the primaries,

This is a common misconception. Look at how much stuff has come out from Trump's past. You probably thought Trump went through lots of vetting in the primaries, but the reality is that it was super light. The same thing is true of Sanders. Clinton went very easy on him and stayed positive for pretty much the entire primaries. The republicans would not have been as nice. 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.