Hillary Clinton and Barack Obama split victories on the biggest day of voting in the race for the Democratic presidential nomination. Clinton won Arkansas, Massachusetts, New Jersey, New York, Oklahoma and Tennessee, while Obama took Alabama, Connecticut, Delaware, Georgia, Illinois, Kansas, Minnesota, North Dakota and Utah, according to projections from television networks and the Associated Press. Voters in 22 states participated in today's Democratic nominating contests; results are still being tallied. New York, Illinois and California are among the day's biggest prizes, though a candidate can take a portion of the delegates in any state without winning the contest there outright. With the vote so closely matched, officials in both campaigns say they expect the battle for the nomination to extend beyond today's Super Tuesday balloting. Obama, an Illinois senator, and Clinton, a New York senator, had each won two of the four contested elections before today. Obama, 46, who is...