Sen. Barack Obama won the Maryland primary to choose a Democratic presidential candidate on Tuesday.For the first time Sen. Barack Obama may  lead over Sen.Hillary Clinton in terms of delegate tally.

Hillary Clinton
12 states, 1,180 delegates (Arizona, Arkansas, California, Florida, Massachusetts, Michigan, Nevada, New Hampshire, New Jersey, New York, Oklahoma, Tennessee).

Barack Obama
21 states, 1,187 delegates (Alabama, Alaska, Colorado, Connecticut, Delaware, Georgia, Idaho, Illinois, Iowa, Kansas, Louisiana, Maine, Maryland, Minnesota, Missouri, Nebraska, North Dakota, South Carolina, Utah, Virginia, Washington state).