WASHINGTON, April 4 (UPI) -- A Democratic strategist says Sen. Barack Obama should not try to knock Sen. Hillary Clinton out of the presidential primary race in Pennsylvania.

LOS ANGELES, April 4 (UPI) -- Some superdelegates are leaving Sen. Hillary Clinton, D-N.Y., in favor of Sen. Barack Obama, D-Ill., whose arguments are "more persuasive," a pollster says.

WASHINGTON, March 25 (UPI) -- The odds against a "dream team" ticket with U.S. Democratic Sens. Barack Obama and Hillary Clinton get longer as the campaign gets fiercer, analysts say.

WASHINGTON, Jan. 10 (UPI) -- The helter-skelter scramble of the U.S. presidential race has analysts for both parties saying polls are pretty much meaningless, The Washington Post reported.

DES MOINES, Iowa, Dec. 8 (UPI) -- Oprah Winfrey hit the campaign trail in Iowa for Democratic presidential hopeful Barack Obama, telling a rally Saturday he "has a new vision."

NEW YORK, Oct. 2 (UPI) -- U.S. presidential hopeful Barack Obama has raised prodigious amounts of money but has yet to hurt support for rival Hillary Clinton, USA Today reported.

WASHINGTON, June 8 (UPI) -- The question of evolution has worked its way into the U.S. presidential campaign because three GOP candidates have said they don't believe in it.

WASHINGTON, Sept. 9 (UPI) -- U.S. President George Bush leads Democratic challenger John Kerry in Missouri and Ohio, a USA Today poll published Thursday indicates.

NEW YORK, Sept. 2 (UPI) -- Five senior Kerry campaign advisers met for breakfast with 50 print reporters in New York Thursday to tamp down stories about staff shakeups.