CASPER, Wyo. (AP) — A poll shows that over 52 percent of Wyoming Republican voters are undecided in the race for the state's lone U.S. House seat.

The poll was commissioned by the Casper Star-Tribune and Wyoming PBS and was conducted by Pulse Research of Portland, Oregon, during the second week of July. The poll interviewed 300 registered Republicans by telephone. The poll's margin of error is plus or minus 5.65 percent.

Of those expressing a preference for a candidate, 21 percent favored Liz Cheney, the daughter of former Vice President Dick Cheney.

Tim Stubson was next with 8.7 percent, followed by Leland Christensen at 4.1 percent and Darin Smith at 2.5 percent. None of the other Republican candidates in the race received more than 2 percent.

The primary is Aug. 16.