a journalist does the research before giving their opinion. If Cenk is just a large wind bag like Rush then I wouldn't have much respect for him. I believe that he actually tries to do some research, that makes him a journalist.
A commentator is a nice word for a "talking head." I doubt Cenk is a talking head.
Don't waste your vote, vote Green or Independent in the next election.
Ergo, commentator minus steady work equals blogger.
Ergo, blogger minus blogs equals Ken.