Vernon Parker

Incumbent Republican Jeff Flake, who had represented this district since 2001, sought the Republican nomination for the U.S. Senate.

After redistricting, the bulk of David Schweikert's 5th district became the 9th district, while his home in Fountain Hills was drawn into the newly created 4th district.

However, as soon as the maps were released, Schweikert announced he would run in the 6th district.

That district had previously been the 3rd, represented by fellow Republican freshman Ben Quayle.

However, in a statement announcing his re-election plans, Schweikert pointed out that he'd grown up in Scottsdale—most of which had been drawn into the 6th as well—had represented it in both the state house and in Congress, and owned a second home there.

A revised map, however, placed Schweikert's home in Fountain Hills into the reconfigured 6th.

Quayle, whose home in Phoenix had been drawn into the 9th but was just outside the boundaries of the 6th, opted to seek re-election in the 6th as well.

During the bitter primary campaign, Schweikert was widely criticised for a mailer that accused Quayle of "going both ways", suggesting that he was bisexual.

On the reverse, the mailer listed issues on which it claimed Quayle had taken both liberal and conservative positions.

Senator Jon Kyl said that "such campaign tactics insult the voters, degrade politics and expose those who stoop to them as unworthy of high office" and Senator John McCain said the mailer was one of the "worst that I have seen" and that it "crosses the boundary of decent political dialogue and discourse".

Incumbent Democrat Raúl M. Grijalva, first elected in 2002, said in February 2011 that he had no plans to run for the U.S. Senate.

The new 4th congressional district encompasses most of the rural areas in the old 2nd district, as well as significant portions of the old 1st, 5th, and 6th districts, according to the final maps of the Arizona Independent Redistricting Commission.

The district is heavily Republican.

Democrat Gabby Giffords, who had represented the 8th district since 2007, was seriously wounded in a mass shooting in January 2011 and resigned her congressional seat in January 2012.

Due to population gains reflected in the 2010 United States census, Arizona's congressional delegation increased from eight members to nine in 2012.

Incumbent Republican Paul Gosar, first elected in 2010, ran for election in the more conservative 4th district.

Baldenegro would have been the first Native American woman to serve in Congress had she had won the seat.

After redistricting, most of the 2nd district was composed of land previously located in the 8th district and was thus more favorable to Democrats.

In October, 2011, the commission released a draft map and by November 5 that year had completed a round of public hearings for input on the draft map.

On November 1, 2011, Arizona Governor Jan Brewer, with the approval of the Arizona Senate, removed Colleen Mathis, the commission's chair, charging Mathis was guilty of "failure to apply the Arizona Constitution's redistricting provisions in an honest, independent and impartial fashion."

On November 17, the Arizona Supreme Court overturned Brewer's decision and reinstated Mathis.

On November 21, Brewer asked the Supreme Court to reconsider its decision and to temporarily reverse Mathis' reinstatement.

The Supreme Court refused.

In the October 2011 redistricting, most of the 7th district became the 3rd district and was more favorable to Democrats.

Paul Gosar, who had represented the 1st district since 2011 moved to Prescott in order to run in this district.

With the October 2011 redistricting, most of the 6th district became the 5th district and continued to favor Republicans.

The 2012 United States House of Representatives elections in Arizona were held on Tuesday, November 6, 2012, to elect the nine U.S. representatives from the state, one from each of the state's nine congressional districts, including the newly created 9th district following the 2010 United States census.

The elections coincided with other federal and state elections, including a quadrennial presidential election, and a U.S. Senate election.

Primary elections were held on August 28, 2012.

Arizona was one of five states (along with Wisconsin, Michigan, Pennsylvania, and North Carolina) where the party that won the most seats did not win the most votes in the state.

The table shows the number and percentage of votes, as well as the number of seats gained and lost, by each political party in the 2012 elections for the United States House of Representatives in Arizona.

Results of the 2012 United States House of Representatives elections in Arizona by district:

In accordance with the Arizona Constitution, the Arizona Independent Redistricting Commission produced new congressional district maps for use in the 2012 and subsequent elections.

The map became final after being cleared for compliance with the Voting Rights Act by the United States Department of Justice, and established the official district boundaries for the 2012 elections.

The map was pre-cleared by the U.S. Department of Justice on April 9, 2012, and was effect for the 2012 elections.

Based upon the new map, the 1st district is slightly friendlier to Democrats than its predecessor.

A special election was held in June 2012 under the boundaries of the then current 8th district, with a primary election held in April 2012; in November 2012 another election took place under the new boundaries of the 2nd district, with a primary scheduled for August 2012.

Babeu dropped his congressional bid on May 11, 2012, instead seeking re-election as sheriff.

This came after he was accused of being lovers with an undocumented immigrant who he threatened with deportation to guarantee his silence.

The Arizona solicitor general would later exonerate Babeu after an investigation.