Democrat Barack Obama and Republican John McCain have swept the Potomac Primary contests in Marylan

(12 Feb 2008) HEADLINE: Obama, McCain sweep Potomac Primaries --------------------------------------- CAPTION: Democrat Barack Obama and Republican John McCain have swept the Potomac Primary contests in Maryland, Virginia, and Washington D.C. Obama's wins put him ahead of Sen. Hillary Clinton in the delegate race. (Feb. 12) ---------------------------------------- Find out more about AP Archive: http://www.aparchive.com/HowWeWork Twitter:   / ap_archive   Facebook:   / aparchives   ​​ Instagram:   / apnews   You can license this story through AP Archive: http://www.aparchive.com/metadata/you...