A Houston official and a former City Council member are headed to a runoff for the vacant U.S. House seat in a heavily Democratic district.

Texans will vote on a large menu of constitutional amendments Tuesday.

The race to fill a Texas congressional seat has candidates but no election date more than three weeks after Rep. Sylvester Turner’s death left a vacancy in a stronghold for Democrats, who are eager to cut into Republicans’ narrow U.S. House majority.