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Special elections during the preceding Congress
In these special elections, the winners were elected during 2014 and seated before January 3, 2015 — except that one was seated on January 3, 2015, the effective date of the predecessor's resignation.

Elections leading to the next Congress
In these general elections, the winners were elected for the term beginning January 3, 2015; ordered by state.

All of the elections involved the Class 2 seats.

Closest races
In seven races the margin of victory was under 10%.

States
Data from The New York Times

