>Maybe a foreign Marxist/Communist takeover of the U.S. can be achieved simply by infiltrating for a couple of decades and massively rigging an election
Only if we allow it to.
Wanna bake your noodle? Do a little digging on a Drop that says Certain Laws have been pre-lifted.. then start looking for USC Laws against communism. See what Penalties there are. How many Laws are left that actually have criminal penalty for being communist? How many are left that prohibit being in Public Office? Repeal Dates?
You'll be amazed.