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Patriots favored by 3.5 points.
According to answers.com, the Steelers were a 4 point favorite over the Seahawks in Super Bowl XL. The Steelers won 21-10.
The lowest point spread of a super bowl was one point
The Cardinals did beat the point spread in the Super Bowl. The point spread was 6 and the Cardinals lost by 4 points.
Pittsburgh Steelers -6.5 is the pointspread for Super Bowl XLIII.
The Patriots were favored by 13 points this year. That is the highest point spread in the superbowl, which makes the Giants' win that much more phenomenal. This is incorrect. The Packers were 14 point favorites in Super Bowl XXXI over the Patriots, and Super Bowl I over the Chiefs. The 49ers were 18 1/2 point favorite over the Chargers in Super Bowl XXIX, which IS the highest Super Bowl point spread.
According to Wikipedia, the Bills were an eight point favorite over the Giants in Super Bowl XXV.
Pittsburgh (-7) vs AZ