You Got to Dance with Them What Brung YouBy: Molly Ivins In her long awaited new collection, the Colt Peacekeeper of American political humor draws a bead on targets that range from the Libido in Chief to Newt Gingrich, campaign funny money to the legislative lunacy of her native Texas and hits a bull's eye every time. Whether she's writing about Bill Clinton ("The Rodney Dangerfield of presidents"), Bob Dole ("Dole contributed perhaps the funniest line of the year with his immortal