NEW : Sen. Michelle Obama urges Cuban to back Obama in appearance with him . Obama will leave campaign trail Thursday after Obama stop and return Saturday . Rest of Thursday events canceled ; Hillary Clinton will stand in on Saturday . McCain references Biden comment that Obama will be tested with early crisis .
NEW : Sen. Hillary Clinton urges Floridians to back Obama in appearance with him . Obama will leave campaign trail Thursday after Indiana stop and return Saturday . Rest of Thursday events canceled ; Michelle Obama will stand in on Friday . McCain references Biden comment that Obama will be tested with early crisis .