But none of those situations applies to McCain. He is simply a replaceable cog in a gigantic machine. There is no vital reason for him to cling to his job.
He's replaceable... Exactly. Replaced by someone who doesn't hold his views.
Sure, a lot of his current activities have been out of spite and self-aggrandizement, etc. But I believe he's fairly liberal for a Republican, and he holds those beliefs strongly. So there
is something vital he's doing -- holding up things in the Senate.
If you were the last vote to prevent socialist expansion of America, would you not feel obligated to cling and fight to obstruct your opponents?