Some leading Democratic think it 's time to wrap up the race . While Republican candidates spar , Obama campaign can quietly prepare for fall . Some drawing parallels with May Republican campaign , which went into 2008 . Republican enthusiasm , support from independents falling as campaign goes on .
Some leading Republicans think it 's time to wrap up the race . While Republican candidates spar , Obama campaign can quietly prepare for fall . Some drawing parallels with 2008 Democratic campaign , which went into May . Republican enthusiasm , support from independents falling as campaign goes on .