He's the leader of the pack. State Comptroller Dan Hynes, who is among the state's top vote-getters, is maintaining a steady lead over the 2004 Democratic field for the U.S. Senate. His Downstate support currently gives him the edge over his four major rivals who are from Chicago. But with more than a third of the voters undecided, the nomination is still up for grabs. Hynes, 35, the only Democratic contender to have won statewide office, is known by nearly three-fourths of likely primary voters. Half of all Democratic primary voters have a favorable opinion of him, while just 6...