Garrulous = talkative. Some who is very talkative is often referred to as being garrulous. Bloviating is a from of being garrulous - when one is a longwinded pompous windbag he is bloviating. He is also being garrulous at the same time by being overly talkative.
Most politicans are garrulous - overly talkative about
little of importance - talking more about themselves.
Another term for someone who tends to be garrulous - is popinjay. A popinjay is a
person who talks way too much in a
conceited manner.
I recently went to a political fundraiser - for
the most part the speakers were garrulous - way to talkative with out saying
anything substantive. There was more bloviating taking place than important discussion. These garrulous windbags were being popinjays.