Pollsters try to create an accurate model of the electorate. But that model can change abruptly, like when Vice President Harris became the Democratic nominee.
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Mara Liasson is a national political correspondent for NPR. Her reports can be heard regularly on NPR's award-winning newsmagazine programs Morning Edition and All Things Considered. Liasson provides extensive coverage of politics and policy from Washington, DC — focusing on the White House and Congress — and also reports on political trends beyond the Beltway.