A British columnist believes it could happen.
From the Guardian:
This week the Guardian sought out Sanders fans who are contemplating switching their allegiance to Trump if Hillary Clinton secures the Democratic nomination.
Almost 700 people replied to the call-out, and some 500 of them said they were thinking the unthinkable: a Sanders-Trump switch.
They explained their unconventional position by expressing a variety of passionately held views on their shared commitment for protecting workers and against new wars, on their zeal for an alternative to the establishment, and on their desire to support anyone but Hillary Clinton.
As one respondent, a 34-year-old male IT technician, put it: “Bernie and Trump agree a lot on healthcare, Iraq war, campaign finance and trade. I really want to move on to something new, new ideas from outside the box. Maybe Donald Trump can provide that.”
The Guardian call-out was not a poll, but controlled surveys by polling companies have identified this small but not insignificant slice of the Sanders crowd who would consider backing Trump.
In an NBC News/Wall Street Journal survey conducted by Hart Research Associates this month, 7% of Sanders voters said they could see themselves supporting Trump. Some 66% said the same for Clinton.
A similar proportion of Sanders folk – 8% – gave Trump a positive likeability rating, compared with 48% for Clinton. That figure is unlikely to be causing Clinton campaign aides much loss of sleep.And of course, a percentage of Cruz fans will vote for Clinton when he loses.
But it does show some voters want results more than they want ideology.