More than one in four Americans say having a Mormon as president would cause concern for themselves or someone in their family, neighborhood or office, presenting a challenge for Mitt Romney, a new Wall Street Journal/NBC News poll finds. In general, Americans are reluctant to admit they harbor biases against particular groups, so the portion of people who say Mormonism is a concern is notable, pollsters said. Mr. Romney is set to be the first Mormon to be nominated for president by one of the major political parties.