Sens. Barack Obama (D-Ill.) and John McCain (R-Ariz.) swept the Potomac primary on Tuesday, with The Associated Press projecting that both men will walk away with solid victories in Maryland, Virginia and Washington, D.C. Obama made a strong statement in the commonwealth, walking away with almost double the votes of Sen. Hillary Rodham Clinton (D-N.Y.), 63 percent to 36 percent. He won the District with 76 percent to Clinton’s 23 percent. It will take some time to count Maryland ballots after polls were kept open an extra hour and a half due to inclement weather. Consequently, there were no results for Maryland’s hotly contested Congressional primaries late Tuesday. McCain took Virginia with 50 percent to former Arkansas Gov. Mike Huckabee’s 41 percent and D.C. with 67 percent to Huckabee’s 17 percent. — John McArdle