"Former Democratic presidential candidate Mike Gravel was caught on tape last week telling a crowd in Washington, D.C., that they should harass a federal prosecutor who helped bring criminal contempt charges against a Palestinian activist," Fox News reports.

The "Palestinian activist" in question, Sami Al-Arian, had been charged with aiding Palestinian Islamic Jihad, a theocratic terror group. A jury acquitted him on some charges and deadlocked on others. In 2006 he pleaded guilty to one count of conspiracy; he is now in federal...