Four's a crowd for Redskins' backfield

When the Washington Redskins opted to keep four tailbacks on their 53-man roster Saturday, it produced three developments: Marcus Mason had shown enough to avoid another year on the practice squad, Rock Cartwright is strictly a special teams player and Ladell Betts ultimately could be the odd man out. As the Redskins began preparations Monday for the season opener at the New York Giants, the three players' emotions ran the gamut. Mason was relieved. "I'm blessed to have this opportunity," he said. Betts was in the dark as to his role. "I have no idea," he said. "That's something the ... Email </a