Elections for the United States Senate will be held on November 4, 2014, with 33 of the 100 seats in the United States Senate being contested in regular elections whose winners will serve six-year terms from January 3, 2015 to January 3, 2021. Additionally, special elections may be held to fill vacancies that occur during the 113th United States Congress.
There are 53 Democratic, 45 Republican and 2 independent senators (both of whom caucus with the Democrats). 33 senators are up for election this year as class 2 Senators, and two are up for special elections (both from class 3). Among the seats up for election in 2014, currently, there are 21 held by Democrats and 14 held by Republicans.
There may be some changes if senators die or resign. If senators in other classes die or resign between 2012 and 2014, there may be additional special elections. The dates between which the death or resignation of a senator would lead to a special election during this time period vary from state to state.