Trump didn't warn about voter fraud. He didn't tell the audience to get out there in large numbers to overcome fraud on the other side. He didn't tell them to stay vigilant and keep people honest. He said the election is rigged so he'll lose. Any candidate who says such a thing is a moron because he has instantly demoralized his supporters by effectively telling them not to bother voting.
... which is why he has never said anything like that again.
What the hell is the difference? Voter fraud is PART of the rigged system. So is a supposed free and impartial press that acts as a propaganda arm of the DNC. ANY Republican POTUS nominee should not mince words about what they’re up against in a national election.
The only people I’ve come across who truly took that as weakness by Trump are the Cruz supporters/#nevertrump crowd and the squishes.