[Steel Wolf]

They slipped into the march and nobody seemed to notice, object or recognize that they weren't actually communists and weren't actually for Kerry.

THAT'S THE POINT.

Good luck going to a pro-Bush rally and holding up a 'Communists for Bush' sign with Stalin's smiling mug on it. (Fashion tip: Wear Kevlar. Lots of Kevlar.)

[Redbob]

"Good luck going to a pro-Bush rally and holding up a 'Communists for Bush' sign..."

And THAT would be because at the Bush rally, there would be folks bright enough to realize that you were not in fact a Communist "For" Bush.
Those loons in NY, however, never realized they were being had.