Indeed, it's a miracle he and Edwards still hold their Senate seats. They should've resigned a long time ago. Then again, it's not like North Carolina and Massachusetts are losing any representation--Edwards isn't running for re-election in NC, and Kerry never did do much. Edwards will hang around until January, but effective November 2, we'll never hear from him again.
My theory on Kerry's refusal to resign comes from the fact that there's a Republican governor in MA right now.
Somebody:
How many states is Bush advertising in?
How many states is Kerry advertising in?
It seems kerry has money trouble and this explains his desperation shouting effort.