I doubt it.
His poll numbers are on the increase because people are waking up - just not all at the same time.
This has nothing to do with his calling the election rigged. But when he wins, this will be their cover 'Trump successfully sold the American people, the same way he ripped off thousands of aspirants in Trump University, a lie."
But I really think it's too late for that to work ... American's have by now been saturated in evidence of the corruption. Trump may not be likable to many of the flaccid Americans ... but they find it hard to think he's the one lying.