Wisconsin Republican Sean Duffy has landed backing from the U.S. Chamber of Commerce. It's the business group's first endorsement in Wisconsin. A spokesman said other "activities" are planned.

Doug Loon, a Chamber vice president, called Duffy "an invaluable leader who has a common-sense approach to job creation and getting America back on the road to recovery."

The endorsement will be officially unveiled during a conference call on Wednesday.

The Chamber had originally planned to announce its endorsement last week, but it was postponed after bad weather delayed Duffy's plane from landing in Washington.

Polls show Duffy neck and neck with Democrat Julie Lassa in the race to succeed retiring Rep. David Obey (D-Wis.).