"Well on the last point I say to them, the way to overcome that concern is to make sure I get the Democratic nomination."
And there you have it; the real Joe Lieberman. The implicit threat: Vote for me in the primary or I will be a spoiler. Voting me out is not an option. The only way to get what you want is if you want I want, so you might as well lie back and enjoy it.
It's called extortion. He's attempting to hold Democratic voters hostage to his ambitions. It was all of a second in a slickly handled interview, but it gives the lie to every other high-minded thing he spouts.