Who will Pennsylvanian Democrats favour when they go to the polls?
Barack Obama, still fighting to leave behind the furore over his remarks about small-town Americans, says he is not predicting he'll win but told a local radio station: "I'm predicting it's going to be close and that we are going to do a lot better than people expect."
Who do you think would make a better Democratic presidential candidate, a better president and a better "leader of the free world"?
What chance do either Mr Obama or Mrs Clinton stand against Republican candidate John McCain in the presidential election?
Is America ready for either a black man or a woman in the White House?
What impact would Mr Obama or Mrs Clinton as president have on British relations with America? And on America's relations with the rest of the world?







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