Interesting article to stumble on, and as an outsider and mocker of the US national football team, I'm surprised to find something kind of cool about them re: the use of DTOM.
But in terms of flags being misused, Australia has one which has been used in both far left wings and far right wings. It's called the Eureka flag.
Originally flown over the Eureka Stockade (a goldminer's small scale revolution which basically turned into an utter, utter defeat to the miners), it was adopted by unions and union movements for years, still is used.
Unfortunately, it's also been adopted by Australian neo-nazis, skinheads, anti-immigrationists, and other unsavoury far-righties that wouldn't look out of place in Russel Crowe's Romper Stomper.
So this is not the first time that such a flag with such resonance has been adopted and supplanted by the opposite side of politics. At least yours has been adopted by a semi-relevant political party (apologies to leftists, but the Tea Party, as far as I can tell, are not looking to exterminate an entire race of people)
Link to the Eureka flag:
http://eurekasydney.com/images/eureka_flag.jpg
Original flag that flew over the Bakery Hill battlefield:
http://www.eurekaflagring.com.au/images/original-eureka_flag.gif
A left-oriented use:
http://alarmcollective.blogspot.com/2007/11/blog-post.html
I can't find a right-wing example, I'm sorry.
Oh, and to keep it football-like, Melbourne Victory fans often use it as well (and defend it vehemently ;):
http://www.mvfcblog.com/327:the-eureka-flag-debacle-another-embarrasment-for-the-ffa/