Leadership: Speaker Nancy Pelosi claims she has no use for polls. For her, that's a good thing, because polls now show that voters despise her. But a politician who disdains public approval should be a little disturbing.Not every House leader has been popular, but none have reached the nadir of Pelosi. Last week, a Public Strategies/Politico poll showed she is now trusted by fewer than one out of four voters. Asked for a reaction by Politico's Glenn Thrush on Monday, Pelosi laughed it off, declaring "I don't care." A response like that can only come from someone so securely unaccountable...