WASHINGTON, March 2 (UPI) -- Democratic presidential candidates spent lavishly on television ads in Ohio and Texas ahead of Tuesday's crucial primaries with some 300 delegates at stake.

HOUSTON, Feb. 6 (UPI) -- Sen. Hillary Clinton, D-N.Y., challenged rival Democratic candidate Barack Obama to four one-on-one debates ahead of the primaries in Texas and Ohio.

DES MOINES, Iowa, Dec. 17 (UPI) -- Just weeks before the Iowa caucuses begin, Bill Clinton surfaced in his wife's presidential campaign with a message of "change, change, change."