The 1980 election featured high inflation, high crime, a weak economy, and a major crisis in the Mideast involving Iran. The American electorate hungered for change and, in the closing stretch of the campaign, they felt assured that Reagan could deliver and was not the dangerous right-wing radical that the Democrats claimed he was.
The parallels with this year suggest that Trump will also get the support of late deciders. Moreover, like Reagan, Trump is an exceptionally good salesman with a talent for closing deals. To adapt the famous movie line, the oval office is for closers.