billmoyers.com – Lanky, athletic Tom Udall doesn’t look like a man in the grips of a Don Quixote-like obsession.

Yet, like the comic-epic hero, the second-term senator from New Mexico is boldly tilting at windmills. For the last three sessions of Congress — ever since the US Supreme Court handed down the 2010 Citizens United ruling that opened the door for corporate entities to make unlimited donations to political campaigns — Udall has doggedly introduced a proposed constitutional amendment to overturn the decision.