The muddy water of the mighty Mississippi River doesn't immediately conjure up images of wine. But vineyards in four Midwestern states are trying to get their land designated as an official appellation area called the Upper Mississippi River Valley. Appellation law works so that wineries from a certain geographic region can distinguish themselves from wines of another region. Napa, for example, has more than 300 wineries. Those wineries are technically the only ones allowed to use the words "Nap
