President George Bush visits Sioux Falls today (Wednesday) . He'll make a major agricultural address and attend a public rally for seven thousand people. But the real reason for his visit is to raise money for South Dakota Congressman John Thune. Thune, a Republican, is challenging incumbent Democrat Tim Johnson. It's a race that's bringing out the nations biggest political guns. It's a race the Bush administration wants to win badly. Mainstreet Radio's Cara Hetland has this report on South Dakota's U.S. Senate race.