To me, this has nothing to do with saintliness. I don't want a saintly President, any more than I would want to have a saintly lawyer to represent me in court.
To me it's like this.
Suppose my car needs work done. I've got three choices. One is my super smart brother inlaw, who will tell me about all the books he's read about auto engineering and such.
One is a shady character who has had a repair garage for years. I know a lot of people who felt overcharged and under served. But she has kept a lot of cars running.
One is my 9 y/o relative who brashly asserts, "I can fix anything. That's a wrench right there, Amirite?! Show me where the hood latch is and then get out of my way".
That is how I see Sanders, Clinton, and Trump respectively. I will pick the mechanic, even though she cheated me out of $75 back in the late 90s. I think she is better than the other options.
Tom