Not ironic at all. The left is about building a coalition of people that are alienated from the historic American majority: Non-whites, feminists, homosexuals, etc. People don’t identify with what their ancestors didn’t create.
I don’t disagree with anything he says, but he’s NOT a good speaker. Far too mannered, with that absurd stress on the silent “H” (wHHHite), and too fidgety with his hands and his eyes.
In politics, these things matter. Mitt Romney lost as much because didn’t appear comfortable in his skin as he did because of all the other reasons that have been given. Other men (Gore, Kerry) who have been similarly stiff have also lost to more superficially charismatic opponents..