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Walden, Hayworth, Glassman and McCain, clockwise from top left.

As the Republican primary battle between U.S. Senator John McCain and J.D. Hayworth heats up, two Democrats may be on the verge of campaigning to be the first Democratic senator from Arizona in 15 years. Read more» 5

Sarah Palin tells a Tucson crowd that 'we're all part of that Tea Party movement.'

John McCain and Sarah Palin appeared together Friday for the first time since the end of the 2008 presidential campaign, on stage at the Pima County Fairgrounds. Read more» 17

John McCain (left) and J.D. Hayworth

Sen. John McCain and John Hayworth lost no time going after each other in what promises to be a heated Republican primary race for Arizona's U.S. Senate seat. Read more»

Former congressman and talk radio host J.D. Hayworth formally announces his primary challenge to Republican Sen. Joh McCain.

Former congressman and talk radio host J.D. Hayworth will appeal to the GOP’s conservative base, but he’ll need to tap into wallets around the state before he can mount a serious challenge to McCain, political scientists say. Read more» 1