Another venue would be to have the lawn mower and bar stool racers run on the White House lawn. The already have the fence for crowd control. I don't know if the lawn mowers croud would fit in but the B/S crowd certainly fits!
The entry fees (taxes) would be so high that only the highly paid politicians could afford to run (and run, and run,and run..........). Entry fees would certainly go up every year.
The posibilities are endless.