Donald Trump Is Gaining Ground on Hillary Clinton in a Crucial Polling Question

But the former Secretary of State still has a large lead.
Photographer: Daniel Acker/Bloomberg
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Donald Trump's not just gaining ground in traditional election polls, which track voter intent.

Asking people who they think will win an election — rather than who they intend to vote for — has been shown to have more predictive power, according to psephologists specializing in the science of elections.