NEW ORLEANS - They're separated by more than 20 years, they come from opposing political parties, and one evicted the other from the White House. But Bill Clinton and George Bush act like a team, a pair of touring comedians with a well-honed act. The two former presidents even have their entrance down pat, striding in with arms aloft, music pounding, lights flashing, the crowd standing and going wild. The pair addressed more than 25,000 people attending the National Association of Realtors convention on Saturday, drawing at least six standing ovations and almost continuous applause. Bush and Clinton thanked the...