of Representatives were up for election in 2018. Republicans retained control of both chambers. Maine All of the seats of the Maine Senate and the Maine House of Representatives were up for election in 2018. Democrats gained control of the state senate and retained control of the house of representatives. Maryland All of the seats of the Maryland Senate and the Maryland House of Delegates were up for election in 2018. Democrats retained control of both chambers. Massachusetts All of the seats of the Massachusetts Senate and the Massachusetts House of Representatives were up for election in 2018. Democrats control both chambers, and the governor is a member of the Republican Party. Democrats hold a veto-proof supermajority in the state legislature. Michigan All of the seats of the Michigan Senate and the Michigan House of Representatives were up for election in 2018. Republicans retained control of both chambers, but Democrats picked up enough seats to break the Republican legislative supermajority. Minnesota All of the seats of the Minnesota House of Representatives were up for election in 2018; the Republican-controlled Minnesota Senate did not hold regularly-scheduled elections in 2018. Democrats won control of the house of representatives, making Minnesota is the only state in the country where each major party controlled one state legislative chamber. Missouri Half of the seats of the Missouri Senate and all of the seats of the Missouri House of Representatives were up for election in 2018. Republicans retained control of both chambers. Montana Half of the seats of the Montana Senate and all of the seats of the Montana House of Representatives were up for election in 2018. Republicans retained control of both chambers. Nebraska Nebraska is the only U.S. state with a unicameral legislature; half of the seats of the Nebraska Legislature were up for election in 2018. Nebraska is also unique in that its legislature is officially non-partisan and holds non-partisan elections, although the Democratic and Republican parties each endorse legislative candidates. Nevada Half of the seats of the Nevada Senate and all of the seats of the Nevada Assembly were up for election in 2018. Democrats retained control of both chambers. New Hampshire All of the seats of the New Hampshire Senate and the New Hampshire House of Representatives were up for election in 2018. Democrats won control of both chambers. New Mexico All of the seats of the New Mexico House of