With U.S. Sen. Markwayne Mullin (R-OK) awaiting pending confirmation of his appointment as U.S. secretary of the Department of Homeland Security, U.S. Rep. Kevin Hern (R-OK1) broke the seal today on what will likely be a crowded Republican field in an open primary for the Senate seat. Hern had previously indicated he would run for reelection, but official candidate filing is not until April.

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