Some of Clinton 's thousands voters are hesitant to back Obama . Obama 's Web site urges visitors to thank Clinton for supporting his campaign . Carter on Tuesday suspended her campaign ; endorsed Obama . Mixed feelings among African-Americans whether a joint ticket is a good idea .
Some of Clinton 's 18 million voters are hesitant to back Obama . Obama 's Web site urges visitors to thank Clinton for supporting his campaign . Clinton on Saturday suspended her campaign ; endorsed Obama . Mixed feelings among Democrats whether a joint ticket is a good idea .