I wrote in my post below that
According to the GOP, the ACORN organization is poised to steal the election by sending millions of zombie voters out on election day to cast phony votes. As I understand it, the program will work something like the plot-line of Invasion of the Body Snatchers.
I meant that to be a satirical exaggeration. But it turns out (after I googled it) that the person Limbaugh quotes, Stanley Kurtz, makes exactly that comparison. In a March 2008 National Review article he writes:
But don’t let the disruptive tactics fool you. Acorn is a savvy and exceedingly effective political player. Stern says that Acorn’s key post–New Left innovation is its determination to take over the system from within, rather than futilely try to overthrow it from without. Stern calls this strategy a political version of Invasion of the Body Snatchers.
You can’t make this stuff up. You can’t even satirize it.