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You might want to rethink your historical comparison there. The reason that Lieberman succeeded as an independent was because the Republicans broke in large numbers to support his candidacy over the stuffed-shirt that their own party was running. Any national third-party/independent candidate can ONLY succeed by drawing significant numbers away from both usually-Democratic and usually-Republican voters, AND capturing a large number of independents. There's virtually no way that Clinton could achieve this. No significant number of core Republicans will support her candidacy over McCain's. All she would achieve would be to siphon away Democratic voters who might otherwise be persuaded to vote for Obama, and therefore hand the presidency to McCain on a silver platter. Fortunately, I think Clinton is smart enough to realize this, although I fear that a good number of her supporters might choose to ignore the potential ramifications and call for an independent candidacy anyway.