Chicago is set to hold a hotly contested mayoral election on Tuesday, with incumbent Mayor Lori Lightfoot facing off against four other contenders, including progressive Rep. Jesús “Chuy” Garcia and Cook County Commissioner Brandon Johnson. Lightfoot has had a contentious relationship with teachers’ and police unions, while Johnson is endorsed by the Chicago Teachers’ Union. With no candidate expected to top the 50% necessary to avoid a runoff, the race is expected to go to an April 4 runoff between the top two vote-getters.