John McCain announced his plans to run again for Senate on November 25, 2008,[1] just 21 days after losing the 2008 presidential race.

In the general election, the candidates were incumbent John McCain (R), Rodney Glassman (D), Jerry Joslyn (G), and David Nolan (L).

[9] On January 20, 2009, Janet Napolitano was confirmed as United States Secretary of Homeland Security by Barack Obama and resigned as governor the next day.

[11] The other Republican candidates were state treasurer Dean Martin, Owen "Buz" Mills, former Arizona Board of Regents president John Munger, Matthew Jette, and Tom Gordon.

[12] Jan Brewer won the Republican primary with approximately 80% of the vote while Democrat Terry Goddard moved on with no opposition.

[17] The three Democrats who ran to fill the vacancy were Arizona's House minority leader David Lujan as well as Felecia Rotellini and Vince Rabago both former assistant attorney general.

[18] The Republican race was between superintendent of public instruction Tom Horne and former Maricopa County attorney Andrew Thomas.

Andrei Cherny, an advisor to Barack Obama, Joe Biden, Al Gore, Hillary Clinton, and John Kerry, won the Democratic nomination.

[21] It will temporarily raise the Arizona state sales tax from 5.6% to 6.6%, with two-thirds of the revenue generated going to support education.