Krissy Keefer's chances of unseating the House Minority Leader are essentially nil, but her quixotic run in San Francisco has tapped into real liberal disillusion -- on Iraq above all.On a recent Sunday in Washington Square Park, in the heart of ultra-liberal San Francisco, Krissy Keefer roamed among the knots of people seated on the grass with the ease of a practiced socialite mingling with old friends. Balancing a to-go coffee cup in one hand, the 60-something dancer with an unruly mane of long, dark, gray-streaked hair would sidle up to elderly couples and young parents, offer them one of...