Iraq Leader Says Violence Won't Stop Vote BAGHDAD, Iraq - The Iraqi prime minister insisted Sunday that the raging insurgency - which has claimed 300 lives in the last week alone and resulted in a wave of kidnappings - will not delay January elections, promising the vote will strike a "major blow" against the violent opposition.    Meanwhile, a grisly videotape posted on a Web site showed the beheading of three hostages believed to be Iraqi Kurds accused by militants of cooperating with U.S...