In heads up play a 2-3 is worth seeing the flop. Your already in the pot so its gonna be free or cheap.
A 2-7 unsuited is the worst hand possible. I think Kerry has a 2-7 suited and only got a 3rd suiter on the flop, needing two running cards to make his flush. Or, in statistical terms, he is a 10-1 underdog.
I agree with your description of those hands, but I think Kerry has a mediocre hand that could be turned into a winner. But this "All In" that he's declared by filing an official complaint with the FEC is insane. He's going to lose now, unless he's gotten some evidence falsified. That's his only hope, as it always has been.