Herseth Sandlin Faces Best GOP Opponent Yet By Anna Palmer, CQ-Roll Call Republicans have unsuccessfully tried to knock off South Dakota Democratic Rep. Stephanie Herseth Sandlin ever since she was elected six years ago in the rural, conservative state. But with what could be a big Republican wave and an anti-incumbent narrative building — not to mention a strong GOP nominee in state Rep. Kristi Noem — party operatives believe they have the right mix of factors to beat the Congresswoman this year. Democrats, meanwhile, are already trying to paint Noem — an anti-abortion, pro-gun, anti-gay-marriage conservative — as a...