Attorneys for two former Blackwater Worldwide security guards from East Tennessee convicted of killing Iraqi civilians made the case Tuesday before a federal appeals court for their freedom...Court filings show the appeal argues at least one key trial witness lied under oath and ultimately recanted his testimony.  Attorneys for the men have also questioned D.C. prosecutors' jurisdiction for a shooting that happened outside the U.S. and have made claims of "vindictive prosecution."  It wasn't immediately clear...when the court might rule on the men's appeal.