House Minority Leader Nancy Pelosi (Calif.) likes to brag about her five grandchildren to reporters, but her demeanor on Capitol Hill is anything but grandmotherly. If the Democrats win control of the House this November, Pelosi would become a brutally partisan far-left speaker. Before she voted against a tax-cut package last November, for example, she said, “They’ll [Republicans] take food out of the mouths of children in order to give tax cuts to the wealthiest.” Pelosi has already promised congressional investigations on energy prices and the War on Terror. On “Meet the Press” last May, she spoke eagerly of the...