Just three years ago, Congress voted to allow more foreign workers into the United States. Times have changed. Politicians are proposing tough — opponents say misguided — steps to keep jobs at home in the face of rising unemployment, a growing number of white-collar jobs being transferred to India and other countries and lingering anger over some U.S. allies' opposition to the war in Iraq. The House has passed measures to require the Defense and State departments to buy a larger share of equipment from U.S. firms. The measure, which has provoked a corporate and political uproar, has not been...