Maryland Democratic Presidential Primary took place on February 12 , 2008 . Nicknamed the " Potomac Primary " or the " Chesapeake Primary " because the District of Columbia and Virginia also held their primaries that day ( and all three border the Potomac River ) , a total of 70 delegates were up for grabs in Maryland . The winner in each of Maryland 's eight congressional districts was awarded all of that district 's delegates , totaling 46 . Another 24 delegates were awarded to the statewide winner , Barack Obama . The 70 delegates represented Maryland at the Democratic National Convention in Denver , Colorado . Twenty-nine other unpledged delegates , known as superdelegates , also attended the convention and cast their votes as well
Democratic National Convention
2008 Democratic National Convention
2008 Maryland Democratic primary