WASHINGTON (AP) - Barbra Streisand, who hedged her bets months ago with donations to Hillary Rodham Clinton, Barack Obama and John Edwards, has settled on one presidential candidate. It's Hillary. ''Madame President of the United States ... it's an extraordinary thought. We truly are in a momentous time, where a woman's potential has no limitations,'' Streisand said in a statement released Tuesday by the Clinton campaign. ''Hillary Clinton has already proven to a generation of women that there are no limits for success.'' The Oscar-winning actress and singer is an FOB - Friend of Bill Clinton - and the endorsement...