As the Michigan State football team prepares to face Notre Dame's shamrock-loving Fighting Irish, Spartans fans will likely see more than a few references to four-leaf clovers this weekend. My model currently ranks Michigan State No. 46 and Notre Dame No. 1 in my latest power poll. As a result, the Spartans' chances of leaving South Bend with a victory are slim. Still, the four-leaf clover offers a useful framework for imagining how an upset might happen. The four leaves of a four-leaf clover traditionally represent faith, hope, love, and luck. If the Spartans are to pull off this upset, they will likely need all four. The first leaf represents faith, which in this case means trust in brighter days. With the arrival of new coach Pat Fitzgerald and generally positive results through two weeks, Spartans fans have reason to believe better days are on the horizon. The second leaf represents hope, or optimism and the courage to look forward. If the Spartans are to have a chance Satu...