Democratic vice presidential candidate and Minnesota Governor Tim Walz greeted supporters in Boston at a fund-raising event Sunday, one day after early voting kicked off in Massachusetts, organizers said.

The two rallies come on the first day of early voting in Wisconsin. Harris is also set to visit Waukesha on Monday.

Kamala Harris's running mate Gov. Tim Walz is campaigning in Omaha -- whose single electoral vote independent from the rest of Nebraksa could turn the electoral college -- on Saturday evening.