<p>January 16, 2004 -- Embattled Democratic front-runner Howard Dean yesterday vowed to tone down his aggressive attacks on rivals after a key ally warned that harsh words could cost him votes, with the battle for Iowa now in an unpredictable four-way tie. Dean also softened his image by sporting a comfy hunter-green sweater instead of his usual rolled-up-for-action shirtsleeves as he headed toward the Monday vote.</p>