Can’t be that easy or Hillary would have won.
Maybe it is that easy, but Hillary is so unpopular that even with cheating, she was behind.
Heck, even right now she's cheating (superdelegates/coin tosses/etc) and yet she's losing in number of votes.
Certain radical people commit voter fraud. They are often illegals living in the area. Campaign workers run an operation of busing in illegal voters who vote multiple times within a State. They did it with Somalis and others last election. Individuals, too, just have no respect for the law and vote illegally. They all have to be very motivated and amoral to do this.
I don’t think Hill has the feverish criminal element behind her. Sanders does, though. However, he’s going to be penalized by the Leftists for being a Jew. They hate Jews at the moment.