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Ballotpedia's coverage of elections held on March 3, 2015, was limited. Select races were covered live, and all results will be added once the merger is complete.
Template:Cong most competitive incumbent primaries 2012
|Most competitive primaries involving incumbents in 2012|
|District||Margin of victory||Primary type||Primary winner(s)||Votes||Runner-up candidate||Votes||Total votes cast|
|Florida's 3rd Congressional District||1.4%||Republican||Ted Yoho||22,273||Cliff Stearns Incumbent||21,398||64,769|
|California's 31st Congressional District||1.84%||Blanket primary||Gary Miller (R) Incumbent & Bob Dutton (R) **||16,708 & 15,557, respectively||Pete Aguilar (D)||14,181||62,667|
|Pennsylvania's 12th Congressional District||2.40%||Democratic||Mark Critz Incumbent||32384||Jason Altmire Incumbent||30,895||63,279|
|New York's 13th Congressional District||2.68%||Democratic||Charles B. Rangel Incumbent||16,916||Adriano Espaillat||15,884||38,506|
|Arizona's 6th Congressional District||2.96%||Republican||David Schweikert Incumbent||41,821||Ben Quayle Incumbent||39,414||81,235|
|Ohio's 2nd Congressional District||5.8%||Republican||Brad Wenstrup||42,482||Jean Schmidt Incumbent||37,383||87,168|
|Texas' 16th Congressional District||6.20%||Democratic||Beto O'Rourke||23,261||Silvestre Reyes Incumbent||20,440||46,091|
|Oklahoma's 1st Congressional District||7.7%||Republican||Jim Bridenstine||28,055||John Sullivan Incumbent||24,058||52,113|
|Illinois' 16th Congressional District||7.9%||Republican||Adam Kinzinger Incumbent||45,546||Donald Manzullo Incumbent||38,889||84,435|
|Tennessee's 3rd Congressional District||8.05%||Republican||Charles J. Fleischmann Incumbent||29,947||Scottie Mayfield||23,779||76,649|
|**Note: California uses a blanket primary system, where one primary is held with the top-two vote getters -- regardless of party -- advancing to the general election.|