-can I create a blog and be protected like him...
No you can't. The First Amendment only applies to the hand fed printing press that they had in 1781 not modern newspapers, radio, TV, the internet blogs...
Oh wait...YOU CAN! Because obviously the 1st Amendment DOES cover you. (What an idiotic thought, that the 1st Amendment would not apply to modern communications...whatever was I thinking.)
Well, it covers you from 'prior restraint'. That is, you can publish whatever you want but you have to take the consequences for it.