WASHINGTON – By more than a 5-to-1 margin, campaign contributions from J.W. Marriott Jr. are flowing toward Republicans this year. For his generosity, the Marriott International chairman may find the party thwarting changes in immigration law his company wants. Marriott and other companies including Intel Corp., Hilton Worldwide and Texas Instruments Inc. are seeking a boost in the number of legal immigrant workers they are allowed to hire.