WASHINGTON (AP) _ Solid margins among women, minorities and young voters have powered Barack Obama to a 6 percentage point lead over John McCain in the presidential race, according to a poll released Tuesday. Obama is ahead of his Republican rival 47 percent to 41 percent, The Associated Press-Ipsos poll showed. The survey was taken after the Democratic senator from Illinois had returned from a trip to Middle Eastern and European capitals, and during a week that saw the two camps clash over which had brought race into a campaign in which Obama is striving to become the first African-American president.