At this point it seems to me that the most likely thing to sink Trump is his people simply not making it out to the polls:
Quote:
Among Americans who identify as Republicans, polls suggest Trump has 25% to 30% of the vote. A survey from Pew Research conducted at the end of September provided more detail about who those individuals are: they are likely to be less educated and less affluent compared to the support base of other candidates.
Yet Trump’s support base could be problematic on election day. In 2008, Americans who didn’t graduate from college were significantly less likely to register to vote compared to those who did graduate.
It does look like Trump supporters tend to be less educated. But the more detailed the demographic data, the less reliable it is, given that pollsters are struggling to find representative samples of Americans to talk to them.
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Source.
The other way is simple attrition. At this point in 2007 Giuliani, with 29%, had a 16 point lead on McCain, with Thompson two points above McCain. At this point in 2011 Romney and Gingrich were tied at roughly 22% with Cain sliding down through 18.
Of course it would take more attrition, as Trump is at 33 with Cruz in second at 16.