U.S. Sen. Ron Johnson has teamed up with the National Republican Senatorial Committee to run nearly $5.6 million in TV ads from Sept. 1 through Thursday.
That includes a series of ads in recent weeks that paint Dem rival Mandela Barnes as a "radical leftist" who's "dangerously liberal on crime."
The NRSC, which has faced questions about its fundraising, has made similar moves in other states, team...
