LA CROSSE, Wis. (AP) — U.S. Senator Ron Johnson says Democratic challenger Russ Feingold is a career politician addicted to holding office. Johnson spoke Saturday at the Wisconsin Republican Party convention in La Crosse. He says he was initially surprised that Feingold announced on Thursday that he was running against Johnson in 2016. But Johnson says Feingold is running because he’s addicted to being a politician and “he just can’t stand being away from it.” Feingold served 18 years in the Senate before Johnson beat him in 2010. Johnson says his race against Feingold will give voters a “pretty clear choice.” Johnson says he expects a “vicious campaign.” Democrats have targeted the seat as one they can pick up as they try to win back majority control.