If numbers remain the same, a Republican will pick up the U.S. Senate in Wisconsin being vacated by retiring Sen. Herb Kohl, according to a Rasmussen poll released Tuesday.
Former Gov. Tommy Thompson leads U.S. Rep. Tammy Baldwin, 50-36 percent.
Baldwin also trails other prospective GOP nominees. Mark Neumann leads Baldwin, 46-37 percent while Jeff Fitzgerald leads by a much closer 41-40.
Thompson, 70, served four terms as governor of Wisconsin before being named Secretary of Health and Human Services by President George W. Bush.
He waged an unsuccessful campaign for the GOP presidential nomination in 2008.
Baldwin, 50, was elected to the U.S. House of Representatives in 1998. Generally considered a liberal, she is a member of the Congressional Progressive Caucus.
She is endorsed by the PAC for Change headed by U.S. Sen. Barbara Boxer (D-CA).
Neumann, 58, is a former member of Congress who left the House in 1998 to make an unsuccessful run against Russ Feingold.
He has the support of U.S. Sen. Rand Paul (R-KY) and U.S. Sen. Jim DeMint (R-SC).
Fitzgerald, 45, is the Speaker of the Wisconsin State Assembly.
Voters will pick their parties’ nominees on Aug. 14.
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