And that statement right there should permanently disqualify him for any elected or appointed office in the US, regardless of his “electability”.
You betcha.
I can prove you're exactly right, constitutionally-speaking:
"No person shall be a Senator or Representative in Congress, or elector of President and 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." -- Fourteenth Amendment, Section 3"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed." -- Second Amendment