Ron Barber, seen here in January with then-Rep Gabrielle Giffords, Arizona Democrat, hopes to keep the seat that his former boss relinquished in the Democratic column in a special election on Tuesday. It is one of three House seats currently vacant. (Associated Press)

Ron Barber, seen here in January with then-Rep Gabrielle Giffords, Arizona Democrat, hopes to keep the seat that his former boss relinquished in the Democratic column in a special election on Tuesday. It is one of three House seats currently vacant. (Associated Press)