Now, in the wake of Pres. Obama's order last Friday to bomb Libya in preparation for establishing a no-fly zone, right-wing radio talkers and others on GOP propaganda outlets are clamoring once again for impeachment. Critics of the president charge that he violated the War Powers Clause by initiating the bombing without first seeking approval of Congress.

Leaving aside the merits of bombing Libya, the case for impeaching the president on these grounds is precarious. For one thing, there are numerous precedents that did not lead to impeachment, starting in 1950 when Pres. Truman invaded Korea without prior notification to Congress.