John McCain
US Senator and Representative from Arizona
Republican National Committee
U.S. political committee that leads the Republican Party of the U.S., a/k/a The Grand Ol' Party/GOP
Mitt Romney
U.S. senator from Utah, former Massachusetts governor
Eugene Clay Shaw Jr
US Representative from Florida
Ben Cardin
Democratic US Senator from Maryland (2007-present)
Barbara Ann Mikulski
Former US Senator and Representative from Maryland (D)