No one is safe: Tommy Thompson 47, Russ Feingold 43

A new Rasmussen Reports telephone survey of likely voters in Wisconsin finds Republican Tommy Thompson edging incumbent Russ Feingold 47% to 43% in a hypothetical U.S. Senate match-up. Five percent (5%) like some other candidate, and four percent (4%) are undecided.

Any incumbent who attracts less than 50% support at this point in a campaign is considered potentially vulnerable.

Thompson, who served as governor of the state from 1987 to 2001 and as secretary of Health and Human Services in President George W. Bush’s first term, is being urged by Republicans to enter the race. However, it remains unclear if he will enter the race. Feingold is seeking a fourth six-year term in the Senate this November.