The story

Sen. Barack Obama's wave of momentum got bigger on Tuesday. And while Sen. John McCain might not have turned the corner, he can now peek around it.

Obama scored a breakthrough win in the Potomac primaries by cutting into Sen. Hillary Clinton's base and winning across the demographic board.

Obama won by overwhelming numbers: In the District of Columbia, he won with three-quarters of the vote. In Maryland and Virginia, he won with two-thirds. Read full article »

CNN's Alan Silverleib contributed to this report

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