Republicans are lining up to take on Democratic Rep. Ann Kirkpatrick in Arizona's sprawling 1st Congressional District, but House Speaker Andy Tobin remains the wild card.

The Paulden Republican must leave the state House under term limits in 2014 and is seriously considering running in the 1st District. He told The Associated Press he expects a decision by the end of next month at the latest.

If Tobin runs in the GOP primary, he'll be taking on a fellow member of the Arizona House, Adam Kwasman. He'll also face a political newcomer who announced his candidacy this week, Springerville businessman and rancher Gary Kiehne.

Tobin's experience in the House began in 2007, and his leadership role likely gives him a leg up, although redistricting put him just outside district.