moderates from their ranks:

Arizona Sen. John McCain, a four-term senator with an independent streak who was the GOP presidential nominee just two years ago, is in a tough primary battle against former Rep. J.D. Hayworth, a conservative talk-radio host embraced by tea party activists.

Utah Sen. Robert Bennett, one of the most conservative members of Congress, is facing a serious challenge from his right, with his vote for President George W. Bush's bank bailout drawing the wrath of conservatives.

In Kentucky, outsider Rand Paul, the son of libertarian Rep. Ron Paul of Texas, is picking up endorsements and crucial support against Secretary of State Trey Grayson, causing consternation for the GOP establishment, especially Senate Republican Leader Mitch McConnell of Kentucky.

Former New Hampshire Attorney General Kelly Ayotte, who national Republicans trumpetedHalsey and Logic co-headline Summerfest's American Family Insurance Amphitheater June 29

It's been a long wait for Summerfest fans who typically get each year's first amphitheater announcements at least eight months in advance, but on Monday Big Gig officials finally revealed a headliner playing the 2018 edition.

Make that two headliners.

Pop star Halsey and rapper Logic will co-headline Summerfest's American Family Insurance Amphitheater on June 29.

Less than three years ago, Halsey was a little-known artist opening an arena tour for Imagine Dragons, including at the BMO Harris Bradley Center. But in 2017, she was the third-most streamed female artist, according to Billboard. She was one of the vocalists on the Chainsmokers' inescapable 2016 hit "Closer," and currently has a song on the top 10 of the Billboard Hot 100, "Bad