2008 United States presidential election in Arizona

• 2008 Arizona Democratic primary
• 2008 Arizona Republican primary

Arizona has long been a Republican-dominated state. At the time, it was represented in the Senate by two Republicans (John McCain and Jon Kyl). It has only supported a Democrat for president once in the last 60 years, when Bill Clinton carried it in 1996. In addition, both the Arizona Senate and Arizona House of Representatives are controlled by Republicans. However, the Governor was Democrat Janet Napolitano, and both parties held four House seats each before the election.

Arizona was McCain's home state and gave its 10 electoral votes to its favorite son. However, he won just under 54% of the vote. By comparison, he'd been reelected in 2004 with 77% of the vote, one of the largest margins of victory for a statewide race in Arizona history. This led to speculation that the race would have been far closer without McCain on the ballot.[19] One major factor is the growing Hispanic vote in the state, a voting bloc that tends to favor the Democrats, although both George W. Bush and John McCain held moderate positions on illegal immigration.

Arizona politics are dominated by Maricopa and Pima counties, home to Phoenix and Tucson respectively. Between them, these two counties cast almost three-fourths of the state's vote and elect a substantial majority of the legislature. Maricopa County, a Republican stronghold since 1948, gave McCain an 11-point victory. This alone was more than enough to make up for Obama's narrow victory in Democratic-leaning Tucson. McCain also did well elsewhere throughout the state, winning the more sparsely populated counties by double digits.

The election also saw Republicans making gains in the state legislature, as the GOP picked up one seat in the State Senate and three seats in the State House. The Democrats, however, managed to win the open seat in Arizona's 1st congressional district, with former state representative Ann Kirkpatrick cruising to victory over Republican Sydney Hay, giving the Democrats a majority of the state's House seats for the first time in 60 years.

Constitution Party nominee Chuck Baldwin, Boston Tea Party nominee Charles Jay and independent candidate Jonathan Allen were registered write-in candidates in Arizona.

Technically the voters of Arizona cast their ballots for electors: representatives to the Electoral College. Arizona is allocated 10 electors because it has 8 congressional districts and 2 senators. All candidates who appear on the ballot or qualify to receive write-in votes must submit a list of 10 electors, who pledge to vote for their candidate and his or her running mate. Whoever wins the majority of votes in the state is awarded all 10 electoral votes. Their chosen electors then vote for president and vice president. Although electors are pledged to their candidate and running mate, they are not obligated to vote for them.[22] An elector who votes for someone other than his or her candidate is known as a faithless elector.

The electors of each state and the District of Columbia met on December 15, 2008, to cast their votes for president and vice president. The Electoral College itself never meets as one body. Instead the electors from each state and the District of Columbia met in their respective capitols.

The following were the members of the Electoral College from the state. All 10 were pledged to John McCain and Sarah Palin:[23][24]

1. Bruce Ash
2. Kurt Davis
3. Wes Gullett
4. Sharon Harper
5. Jack Londen
6. Beverly Lockett Miller
7. Lee Miller
8. Bettina Nava
9. Randy Pullen
10. Michael Rappoport