By RON FOURNIER (AP) Democratic presidential hopeful U.S. Sen. John Kerry, D-Mass., rests his arm on the shoulder of Ray... Full Image John Kerry battled hard-charging John Edwards in the Wisconsin primary Tuesday, a surprisingly close contest that established the North Carolina senator as Kerry's sole rival as the Democratic presidential race thunders toward a 10-state showdown March 2. The senators - Kerry from Massachusetts, the first-term Edwards - were running even, according to early results. Fallen front-runner Howard Dean trailed far behind, his candidacy doomed. Close race or not, Kerry said, "A win is a win." Edwards, his dream...