congress, or elector of president, or vice-president, or hold any
office, civil or military, under the United States, or under any
state, who, having previously taken an oath, as a member of congress,
or as an officer of the United States, or as a member of any state
legislature, or as an executive or judicial officer of any state, to
support the constitution of the United States, shall have engaged in
insurrection or rebellion against the same, or given aid or comfort to
the enemies thereof. But congress may, by a vote of two-thirds of each
house, remove such disability.