Signs that Republican Colin Powell will support Barack Obama for president By THOMAS M. DeFRANK DAILY NEWS WASHINGTON BUREAU CHIEF WASHINGTON - After months of playing political Hamlet, Colin Powell is finally ready to tell America who he likes for President - and the smart money says Barack Obama is Powell's choice. Sources close to the retired four-star general and American icon cautioned that Powell's support for Obama over John McCain might stop short of a formal endorsement when he's interviewed on NBC's "Meet the Press" Sunday. Given Powell's cautious nature, he might decide to make his endorsement of Obama...