Potomac primary
The Potomac primary (named after the river that splits the region), also called Chesapeake Tuesday, the Beltway primary, and the Crabcake primary, is the confluence of three Democratic presidential primaries and three Republican presidential primaries that takes place after Super Tuesday in Maryland, Virginia, and the national capital of Washington, D.C. == 2008 == === Republican primaries === 2008 District of Columbia Republican presidential primary 2008 Maryland Republican presidential primary 2008 Virginia Republican presidential primary === Democratic primaries === 2008 District of Columbia Democratic presidential primary 2008 Maryland Democratic presidential primary 2008 Virginia Democratic presidential primary === Results === The results on both sides were fairly unsurprising according to opinion polling, with both John McCain and Barack Obama winning by substantial margins. For Obama, however, the race had been significant as a major source of delegates in the close Democratic race, with him garnering a net gain of 50 delegates.