In Congress, Madison persuaded the three congressmen representing districts on the upper Potomac River (Alexander White and Richard Bland Lee of Virginia and Daniel Carroll of Maryland) to switch their votes on assumption. In addition, George Gale, a resident of Maryland's eastern shore and a long time supporter of the Potomac, agreed to change his vote. In the Senate, Charles Carroll, whose twelve thousand acre estate bordered on the Potomac near Frederick, Maryland, also changed sides at Madison's request.