A Washington watchdog group has called on Congress and the IRS to investigate Rep. Richard Pombo, R-Tracy, for a laundry list of what it calls the lawmaker's ethics violations.Citizens for Responsibility and Ethics in Washington -- CREW -- on Thursday released a 13-count ethics complaint and a letter it sent to the Internal Revenue Service.Pombo called the charges a politically-motivated assault timed to appear just weeks before the June 6 primary election, where he has two opponents."I have never engaged in any illegal or unethical conduct whatsoever in my nearly 14-year career in the House, nor has any evidence been...