On Saturday, May 1, the 136th running of the Kentucky Derby, some 20 thoroughbreds will run for the roses in the most famous and important race in the sport. That race of 3-year-old colts (and one filly) will be won in just over two minutes. Meanwhile, another exciting horse race – the race to win the GOP presidential nomination – is gearing up. It, too, has a large field, but this race is a marathon that takes four years to complete. Now, the time has come to begin handicapping the 2012 primary race. This list represents a snapshot of a...