First it was John Edwards's mansion preventing him from fighting poverty. Now, it's Al Gore's energy-guzzling mansion stopping him from fighting global warming. Gore's getting solar panels on the roof and all his energy is renewable. But that's not the point.
If you want to lead a movement, you should not have the slightest appearance of hypocrisy. That means no mansions, no SUVs, no exploited immigrant maids, nothing. If it means living a little below your rich buddies, so be it. This is not just your job, it is your responsibility to a movement of millions of people who have put their trust in you as their leader.
Probably no candidates are going to read this. But the point is, leaders should lead by example.