WASHINGTON, July 20 (UPI) -- Democrat Barack Obama already has the largest presidential campaign in history, and the Illinois senator's staff is still growing, observers say.

WASHINGTON, June 30 (UPI) -- Aides say likely U.S. presidential candidate Sen. Barack Obama is aggressively courting voters in the U.S. South, a region long considered hostile to Democrats.

WASHINGTON, April 3 (UPI) -- Barack Obama's Democratic presidential campaign is looking to bring new U.S. voters into the fold, party officials said.

DES MOINES, Iowa, Jan. 27 (UPI) -- U.S. Sen. Hillary Rodham Clinton was in Iowa Saturday hoping to drum up support in the state's 2008 Democratic presidential caucus.

WASHINGTON, Dec. 6 (UPI) -- The South Dakota attorney general's office is reviewing allegations of fraud in the November election in which Democratic Sen. Tim Johnson beat his Republican c

Several South Dakota Republican pollwatchers and workers say they witnessed serious irregularities in the Nov. 5 election in which incumbent Democratic Sen. Tim Johnson eked out a 528-vote victory. Democrats said the charges are untrue.