He is, and so are a very large number of people associated with him.
That is not an exhaustive list. But people who want things to improve should also shut down their ability to confect scandals or distractions, like the "Obama tan suit" controversy. Once Americans have a reasonable selection of non-insane non-compromised candidates, things may get better. The election of Mamdani is a good start in that direction, because all the other (D) candidates were horribly compromised.
Indeed, the actual controversy with Obama should’ve been all of the war crimes.
Like the Iraq war, those had very strong bipartisan support.