A trio of Republicans have defected from their party's likely presidential nominee and kicked off an effort to garner support for Democratic presidential candidate Barack Obama. The group, called Republicans for Obama, is led by two moderate Republicans -- James Leach, a former U.S. representative from Iowa, and Lincoln Chafee, a former U.S. senator from Rhode Island -- along with Rita Hauser, a prominent fund-raiser for President George W. Bush. Their reasons for crossing party lines are diverse, ranging from the war in Iraq to overspending in Washington, and signal unhappiness not just with the candidacy of Republican Sen. John...