Arizona state Sen. Kelli Ward is set to formally resign her seat to focus on her Republican primary challenge to U.S. Sen. John McCain.

Ward says in a letter to Senate President Andy Biggs that she will vacate her seat on Tuesday. The Dec. 2 letter says she plans to devote her energy to defeating the five-term senator and 2008 Republican presidential nominee.

Ward is a physician from Lake Havasu City whose current district spans much of Mohave and all of La Paz counties.

The Supreme Court on Monday upheld Arizona congressional districts drawn by an independent commission and rejected a constitutional challenge from Republican lawmakers.

The 5-4 outcome preserves efforts in 13 states to limit partisan influence in redistricting. Most notably, California uses an independent commission to draw electoral boundaries for its largest-in-the-nation congressional delegation.

Ryan Heinsius

As thousands of ballots are still being counted throughout the state, election officials are getting a clearer picture of voter turnout. As Arizona Public Radio’s Ryan Heinsius reports, participation was average in Coconino County with some noteworthy exceptions.

Ryan Heinsius

Arizonans voted on three statewide propositions yesterday. As Arizona Public Radio’s Ryan Heinsius reports, one of those measures could redefine the state’s relationship with the federal government.

Ralph Freso/AP

UPDATE: Wednesday morning Andy Tobin conceded defeat to Rep. Kirkpatrick. In a statement from her campaign staff, Kirkpatrick said she is "deeply honored" to have been reelected. 

Justin Regan

Today is Election Day, and polls are open until seven o’clock across Coconino County.Earlier today, Arizona Public Radio’s Justin Regan spoke with Flagstaff residents as they exited their polling places on what issues brought them out to vote.

Michael Chow/The Republic

Arizona Public Radio’s Howard Fischer reports that Gov. Jan Brewer has some last-minute advice for Fred DuVal and Doug Ducey as they face off tonight in the first of a series of debates.

 In the election battleground states, 60 percent of Latinos polled said they are “very enthusiastic” about voting in the presidential election. Typically in a presidential election about a third of Latinos registered to vote actually do.

More than half of registered Latinos polled said they know an undocumented immigrant -- either someone in their family or a close friend. About a third said they know someone who was questioned by police, detained or deported.