ALBUQUERQUE, N.M. (Reuters) - The Democratic presidential hopefuls differed on trade and taxes at their second debate on Thursday, but saved their harshest attacks for President Bush (news - web sites)'s leadership in Iraq (news - web sites) and on the economy. Rather than putting the surging Howard Dean (news - web sites) on the hot seat, the Democrats vying for the right to challenge Bush in 2004 spent the bulk of their time condemning the president's leadership and touting their own proposals. "This president is a miserable failure," said Missouri Rep. Richard Gephardt (news, bio, voting record), using a...