had withdrawn a report that found no correlation between reduced tax rates and increased economic growth after some Republican Senators took exception to it.  ("Nonpartisan Tax Report Withdrawn After G.O.P. Protest" by Jonathan Weisman, November 1.) But "withdrawn"... The U.S. electric power system is vulnerable to a variety of threats, from natural disasters to operational errors to sabotage or terrorist attack, a newly disclosed report from the Congressional Research Service says. Over the years there have actually been tens of thousands of recorded attacks on electric power targets,...