Randi Rhodes, an afternoon host for the progressive Air America radio network, was suspended Thursday after repeatedly insulting Hillary Rodham Clinton at an event last month. Ms. Rhodes used vulgar language that likened Ms. Clinton to a prostitute at an event sponsored by KKGN, the Air America affiliate in the San Francisco area, on March 22. A video of Ms. Rhodes’ remarks was published to the video-sharing Web site YouTube on Tuesday, prompting condemnations by some bloggers.