This was discovered and researched by William Jacobson, Professor at Cornell Law School.
Background and documentation here:
http://legalinsurrection.com/2012/09/elizabeth-warrens-law-license-problem/
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“The U.S. re-electing Obama would be like the Titanic backing up and ramming the iceberg again.”
That is the best analogy I have seen to date on why Obama should not have four more years.