Democrats swept Virginia and New Jersey's governor's races, incumbents came out on top in several big-city mayoral races and voters in Maine said they wanted to join 31 other states in expanding Medicaid under the Affordable Care Act.

A rundown of the top races around the country on Tuesday:

TWO GOVERNORS

Voters in two states picked replacements for their term-limited governors — Democrat Terry McAuliffe in Virginia and Republican Chris Christie in New Jersey — in contests seen as an early referendum on the presidency of Donald Trump. In swing state Virginia, Democratic Lt. Gov. Ralph Northam...