NEW YORK (Reuters) - A U.S. federal judge on Thursday upheld a government decision to refuse a prominent Swiss Muslim entry into the United States, saying the question of denying visas was best left to the authorities. The United States had revoked the visa of Tariq Ramadan, an academic at Britain's Oxford University and a vocal critic of the U.S. invasion of Iraq and its support of Israel. The State Department initially gave no reason, but later said Ramadan had been barred under a provision of the USA Patriot Act that bars anyone who endorses terrorism. In October the American...