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The AP-GfK poll finds that Clinton has secured the support of 90 per cent of likely Democratic voters, and also has the backing of 15 per cent of more moderate Republicans. Just 79 per cent of all Republicans surveyed say they are voting for their party’s nominee.

With voting already underway in 37 states, Trump’s opportunities to overtake Clinton are quickly evaporating — and voters appear to know it. The AP-GfK poll found that 74 per cent of likely voters believe Clinton will win, up from 63 per cent in September.

Troubles with President Barack Obama’s signature health care law have given Trump a late opening to warn voters against putting another Democrat in the White House. And the poll was taken before the government projected sharp cost increases.

But even Republicans question whether the rising price of insurance premiums is enough to overcome the damage the businessman has done to his standing with women and minorities.

Photo by Andrew Harnik / AP

“Donald Trump has spent his entire campaign running against the groups he needs to expand his coalition,” said Whit Ayres, a Republican pollster who advised Florida Sen. Marco Rubio’s failed presidential campaign. Ayres called Trump’s campaign “strategically mindless.”

Even if Clinton’s support plummets in the contest’s closing days, or she’s unable to motivate strong turnout in her favour, it’s not clear that Trump could marshal the resources to take advantage and collect enough states to win the 270 electoral votes needed to claim the White House.