This looks like a job for Bill O'Reilly.
Liberal teachers are a dime a dozen. I sure wouldn't worry about it or get agita or anything. I told my kids to let me know whenever they heard anything in school from a teacher that "just didn't sound right". I also would keep track of my kids' subject matter and make sure to give them the correct take on things. We would often have a good laugh together at the teacher's expense.
But most important, I always told my kids to puke back out on their tests whatever liberal crap the teacher wanted to see. Just make sure to get an 'A'. I told them to keep their mouths shut, try to understand that their liberal teacher was just a scumbag, smile and pretend to buy every liberal chunk hurled at them, and puke it all back out on their test - - just get the 'A'.