Challengers who defeated incumbents in 2010's state legislative elections

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State house elections
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Parties with candidates
Impact of term limits
Successful challengers
Defeated incumbents
State house elections
State senate elections
State legislative elections

For the incumbents who were defeated by these challengers, see: Incumbents defeated in 2010's state legislative elections.

Challengers who won primaries

96 state legislative challengers defeated incumbents in primaries in the 2010 state legislative elections. This includes:

  • 77 challengers to incumbent state representatives (40 Democrats and 37 Republicans)
  • 19 challengers to incumbent state senators (12 Democrats and 7 Republicans)
  • 52 Democratic challengers to incumbent Democrats (40 state representatives and 12 state senators)
  • 44 Republican challengers to incumbent Republicans (37 state representatives and 7 state senators)

State houses

See also: State house elections, 2010

Democratic

Republican

State senates

2010 State senate elections
ALAKARARCACOCTDEFLGAHIIDILINIAKYMEMDMAMIMNMOMTNENVNHNYNCNDOHOKORPARISDTNTXUTVTWAWVWIWY
Parties with candidates
Impact of term limits
Successful challengers
Defeated incumbents
State house elections
State senate elections
State legislative elections
See also: State senate elections, 2010

In 2010, state senate elections were held in 43 states, with 1,167 state senate seats at stake. A total of 19 challengers in 11 states defeated an incumbent state senator, including 12 Democrats and 7 Republicans.

There was no primary challenger in 708 of the 1,167 state senate districts in play in 2010, leaving 459 districts with a primary. The 19 challengers who toppled an incumbent represent 4.1% of all incumbent-challenger primary contests in 2010, and 1.6% of all state senate seats at stake in the year.

Six of the victorious challengers were from Maryland. Minnesota, New York and West Virginia each had two successful primary challengers, while Alabama, Arizona, Iowa, South Dakota, Washington, Wisconsin and Nevada had one each.

(Note: The incumbent defeated by Lori Klein in Arizona had only been in office starting in 2010 as an appointee.)

Donkey symbol.png Democratic

Maryland:

Minnesota:

Chris Larson, incumbent-toppling Democratic candidate for Wisconsin State Senate, District 7

New York:

South Dakota:

Washington:

West Virginia:

Wisconsin:

Gop logo2.jpg Republican

Elizabeth Halseth, one of 7 Republican state senate challengers who defeated a Republican state senate incumbent in a 2010 primary

Alabama:

Arizona:

Iowa:

Maryland:

Minnesota:

Nevada:

West Virginia:

Challengers who won in November

Pending

See also