WASHINGTON — It's a jungle out there in political television advertising, what with parrots, chicks, dogs and pigs taking turns in commercials that bite and scratch in a way no nonpartisan pet ever would. "You can keep it," squawked a parrot in a Club for Growth Action ad that ran earlier in the year in Arkansas. It was meant to ridicule President Barack Obama and Sen. Mark Pryor's now-abandoned claims that state residents could keep their health insurance if they liked it.