For some, like Amy Siegel of Natick, Massachusetts, the anti-Sanders feeling relates back to the 2016 Democratic primary, when she supported Hillary Clinton and believed Sanders ran a divisive campaign that wounded her before the general election. This time around, Siegel, 57, initially supported Buttigieg. But she voted for Biden in her state’s primary, held on Super Tuesday, days after Buttigieg dropped out and endorsed the former vice president. Siegel said she decided to flip her vote even before Buttigieg exited the race.