Democratic Party chief Howard Dean is expressing concern about the angry tone of his party's presidential campaign.
Dean says Barack Obama, Hillary Clinton and their supporters should beware of tearing each other down, demoralizing the base and damaging the party's chances of winning the White House in November.
In an interview with The Associated Press, Dean says the charges and countercharges between Clinton and Obama have gotten too personal at times.
Dean also says he hopes the Democratic nominee will be determined shortly after the voting ends in June. Dean says he will encourage the superdelegates who will play a role to make up their minds before the August convention in Denver.