[hope this works!]
In doing my digging/research into all things circus, I have found that there is currently a bill before the U.S. House titled Traveling Exotic Animal Protection Act. This bill is a proposed ammendment to the Animal Welfare Act to restrict the use of exotic and non-domesticated animals in traveling circuses and exhibitions. Link: http://www.govtrack.us/congress/bills/112/hr3359
Seems to have been assigned to a committee in Nov 2011, and not seen the light of day since. The web implies the bill was co-sponsored by Boulder, CO rep Polis.
Thought I'd share with the PPART incase anyone had thoughts on how to support/re-energize it...