RAPID CITY, SD—John McCain escalated his attacks on Obama's leadership credentials Tuesday by endorsing a series of rhyming Burma-Shave-style billboards that accuse the Democratic presidential candidate of being out of touch with the current political landscape. "Barack Is Sipping/Fine Champagne/While U.S. Jobs/Go Down The Drain/ McCain '08," read the five consecutive 2-by-5-foot bright red wooden signs erected along a 1.5-mile stretch of South Dakota highway, emulating an advertising medium first popularized by the Burma-Vita Company in 1926 to sell brushless shaving cream. As a follow-up to the scathing roadside polemic, McCain announced plans to lampoon Obama's foreign policy inexperience in a short skit alongside comedian Bert Wheeler and the vivacious Dorothy Lee, to be seen on the late-night variety program Cavalcade Of Stars on the DuMont Television Network.