 This is the day the U.S. celebrates its declaration of independence from the British government. In a moment, we'll hear from NPR listeners about what that document means to them. But first, we go to Britain, where this 4th of July sees voters casting ballots for a new parliament and prime minister. Polls show that after 14 years of Conservative Party rule, the centre-left Labour Party is forecast to win, possibly in a landslide.