(AP) Former Sen. George McGovern, who backed Hillary Rodham Clinton, is urging her to drop out of the Democratic presidential race.

McGovern said Wednesday he has decided to endorse Barack Obama.

After watching the returns from the North Carolina and Indiana primaries Tuesday night, McGovern says it is virtually impossible for Clinton to win the nomination.

McGovern says he is calling former President Bill Clinton to tell him of the decision and adds that he remains close friends with the Clintons.