He said he would raise taxes in the debate last night, and something about him raising them in NY when he was mayor. He also had his strongest line when he said something about Bernie losing if he is the nominee, so I would still say there is more evidence that it is getting Trump out of office is his number one priority.
If it wasn't he could have just not ran, and helped Trump, because there is no way Trump is going to raise taxes.
It is being sold that Joe, Pete, and Amy are 'right wing' Democrats if that is who you mean, they are not right wing by any stretch of the imagination. Bloomberg and Warren were the only ones that used to be Republicans on that stage last night, and I would call Warren right wing anymore either.
He still has next debate to see if he can shake off the cobwebs. It will be interesting to see how he does.