Republican Senate candidate Joni Ernst of Iowa has a double-digit lead over her closest primary opponent in a new poll from Loras College. The survey of 600 likely Republican primary voters found Ernst, a state senator, with 30.8 percent support, while businessman Mark Jacobs comes in second with 19.3 percent support.

Sam Clovis and Matt Whitaker come in behind with 9.5 percent and 7.3 percent, respectively, while 29.2 percent remain undecided.

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