First sighting: "And someone should have followed up on Petraeus' curious statement that the US isn't providing weapons to Sunni tribes. David Kurtz at Talking Points Memo made a plausible guess that this comma-dancing may be based on the notion that the US isn't giving weapons to the tribes, but instead giving them money to buy weapons." - Bruce Miller, The Blue Voice
A google search revealed this as a definition (written by the same blogger that wrote the comment above, three years earlier): "I use "comma-dancing" to describe the hair-splitting over words of which conservatives often seem so fond. E.g., "No, I said 'some people say that all Democrats but Zell Miller are subhuman degenerates'; I didn't say that *I* said that. (Ain't sayin' I didn't say it either.)" "By the way, I stole that "comma-dancing" phrase from someone and I've assimilated it so much that I've forgotten where it came from."