Karl Rove can stare down special prosecutors, intimidate rivals and dispatch Democratic presidential nominees to deep oblivion, but he's no match for the frugal wiper. Getting downwind of Sheryl Crow could be everybody's nightmare. Miss Crow is a pop singer of some repute, as such reputations go, but like a lot of dance-hall glitteries she wants to do bigger things than sing songs about old boyfriends who dumped her. She's busy at the moment trying to cool down the globe, having just completed a transcontinental bus tour with her gal pal, a Los Angeles housewife named Laurie David, promising bemused...