He words things this way to get you to keep listening. Just like TV viewers, the more listeners he has, the more money he can make. He is very intelligent and very well educated (I believe he is a doctor of something) and I would say I agree with 50% or more of what he says. Leftist is a term usually used towards extreme liberals, which talk radio is associates with democrats. Most of talk radio refers to dems as "lefties".
To decide if he is right or a wacko, just keep listening for awhile and then decide how much you really agree.