Probably more of a leftist than Alan Alda. He’s described as an Activist in wiki. The last bit on his activism should give you an idea.
In 2016, after the US presidential election of Donald Trump, Farrell appeared in a commercial to urge Republican electors to block Trump from becoming president by having 37 electors vote for John Kasich instead.
I once enjoyed watching The Voice. I still love the concept of the show, but will not give any of my time to the hate-Trump leftists on the panels.
He is more leftist than Alan Alda.
One day Alda was giving an interview to TV Guide magazine while on the set of MASH when Farrell happened to stroll by. Alda called out to him, “Hey! I hear you’re running for the Politburo!”