FILE - This combo image of file photos shows biggest Republican presidential campaign donors, from left, Sheldon Adelson, owner of the Las Vegas Sands casino empire; Harold Simmons, owner of Contran Corp.; Bob J. Perry, head of a Houston real estate empire; Robert T. Rowling, head of Dallas-based TRT Holdings; and William Koch, an industrialist. (AP Photo/File)

Associated Press
FILE - This combo image of file photos shows biggest Republican presidential campaign donors, from left, Sheldon Adelson, owner of the Las Vegas Sands casino empire; Harold Simmons, owner of Contran Corp.; Bob J. Perry, head of a Houston real estate empire; Robert T. Rowling, head of Dallas-based TRT Holdings; and William Koch, an industrialist. (AP Photo/File)
FILE - This combo image of file photos shows biggest Republican presidential campaign donors, from left, Sheldon Adelson, owner of the Las Vegas Sands casino empire; Harold Simmons, owner of Contran Corp.; Bob J. Perry, head of a Houston real estate empire; Robert T. Rowling, head of Dallas-based TRT Holdings; and William Koch, an industrialist. (AP Photo/File)
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