The Super Bowl needs a ratings boost like a racecar could use more horsepower.No program in television history has lured more viewers. No single sporting event is capable of commercially generating more hype.This time, the NFL’s annual national holiday has some competition for the attention, drama and intrigue. The challenge has come from within: the league’s semifinals.The conference championship games set for Sunday have all but guaranteed a popular pairing for the title game in New Jersey on Feb. 2, but the peak of this postseason could actually be reached this weekend.“It’s hard to find a better set of four.