The Democratic Party's official talk radio host got violent yesterday, in an altercation he described as an effort to protect free speech. Attending a Howard Dean rally in New Hampshire, unfunny funnyman Al Franken physically assaulted a heckler in the crowd, wrestling him to the ground in a bid to silence him. "I got down low and took his legs out," Franken boasted to the New York Post afterwards. The altercation was witnessed by NBC Washington Bureau chief Tim Russert, who called Franken's antics "unbelievable." "One of the Lyndon LaRouche guys got up and started screaming and yelling," Russert...