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As Republicans continue to flout the law, what legal powers can Democrats summon?
http://www.huffingtonpost.com/rep-linda-sanchez/why-karl-rove-should-go-t_b_113417.html
Karl Rove refused a subpoena. How can this happen?
A subpoena is backed by the force of law, which means at some fundamental point there is the implied threat of violence to enforce that law, that there's some "cop" somewhere. How would this work in practice?