Where does this Received Wisdom come from that Bloomberg is a 'centrist' candidate. What exactly is more 'centrist' about him than e.g. Warren. The tax thing? She muses about a (fictional, unconstitutional) tax & he doesn't, they agree on everything else, hence he's 'centrist'?
Some, like McCain, will actively help out the permanent gvt as long as he gets to start more wars - which the permanent gvt doesn't mind as long as he doesn't actually *win* and install military governors of our new conquered territories - the DoS wouldn't approve.