The Republican primary for U.S. Senate in Iowa is wide open, according to a new survey of GOP voters in the Hawkeye State. Mark Jacobs, a businessman and self-funding candidate, leads the pack with 22 percent, while state senator and Iraq veteran Joni Ernst earns 11 percent. Two more candidates, former U.S. attorney Matt Whitaker and radio host Sam Clovis, round out the field with 8 percent and 6 percent, respectively.

A total of 50 percent of primary voters, however, say they are undecided with months to go before the June 3 primary.

The poll was conducted on behalf of the Jacobs campaign, and it also found that Jacobs has higher name identification among likely Iowa general election voters than any of the other Republican candidates, at 34 percent. That's compared to the presumptive Democratic nominee, congressman Bruce Braley, of whom 67 percent of those polled say they know.

According to the poll, Jacobs and Braley would effectively tie in a head-to-head matchup, with Jacobs polling 42 percent to Braley's 41 percent. The polling memo did not indicate if surveys of similar matchups between Braley and the other Republican candidats were conducted.

Braley, Jacobs, and the rest are running for an open Senate seat being vacated by retiring Democrat Tom Harkin.

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