WASHINGTON -- In an early sign of the imagery that may flood the nation's television screens as congressional elections approach this fall, a conservative political group closely aligned with the Bush administration has launched a blitz of television ads to shore up sagging public support for the war in Iraq. The television commercials feature vivid portraits of smoke pouring from the World Trade Center and the aftermath of terrorist attacks in Madrid and London as veterans of the Iraq war and parents of fallen soldiers make the case for continuing the U.S. military campaign in Iraq.