Pretty Americentric line of thought considering us dirty gaters have international "membership", but this also applies to the West in general.
Call it China or the Globalists -- 'and' is probably more appropriate, but there's been a deliberate decades long attack on our educational institutions, our government, our economy, the Christian religion, our borders, Communist infiltration of key positions in government and industry, etc. etc. etc.
And it's been so effective, I just don't see a reversal of course. Even if the moderate collective pulled the wool from their eyes and took action, we're still due for an economic implosion as the debt bubble eventually pops, and we'd have to deal with the indoctrinated masses who would violently resist being jacked out of the Matrix.
Personally, by this point I'm not even thinking about saving the republic, but rather what actions will need to be taken to build something better from its ruins.
I remember reading some two-bit sci-fi dime novel about a President who deliberately nukes the biggest cities in the country to deliberately get rid of the uber-liberal city folk, and force a more agrarian lifestyle to return. I seem to recall the end of it describing a farmer with his donkey cart in the aftermath. Can't remember what it was called, though.
Communist cambodia?