As a longtime leader of the Cobb County Democrats, Jacquelyn Bettadapur has become highly attuned to the factors shaping her party’s fortunes in her home state of Georgia: the rise and fall of Stacey Abrams, Democrats’ unexpected surge in 2020, the enduring influence of Donald Trump. Now, Bettadapur is worried about the political prospects of the woman positioned to be President Biden’s heir — Vice President Harris. “People are poised to pounce on anything — any misstep, any gaffe, anything she says — and so she’s probably not getting the benefit of the doubt,” said Bettadapur, who recently stepped down...