Congressional elections operated by individual state governments House of representatives elected every two years by popular ballot number of seats is determined by population each state has at least one representative each district has about a half million residents U.S. Senate elected every six years by popular ballot(since ratification of the Seventeenth Amendment one third of the senate is elected every two years each state has two SenatorsCongressional Elections • operated by individual state governments • House of Representatives – elected every two years by popular ballot – number of seats is determined by population – each state has at least one representative – each district has about a half million residents • U.S. Senate – elected every six years – by popular ballot (since ratification of the Seventeenth Amendment) – one third of the Senate is elected every two years – each state has two Senators