Noachian; "liberal democratic" (lower case) does not mean Liberal Democratic (as in party affiliation). We are a liberal, democratic society - even as a republic.
No disrespect, but you should get a good definition of the words being used (lower case - not party affiliation).
The Framers were "liberal" in their time, but that word has changed meaning over the years. The last thing the Framers wanted was a democracy, which always leads to ruin.
What this country has morphed into is more of a socialist society than a democratic society.
To say that we're a republic with a liberal democratic political system really can't be justified.