Is "Invictus" really a sports movie?

Up until this morning, I was thinking Clint Eastwood's Invictus was going to be a filmed biography of South Africa's Nelson Mandela. Now, after seeing this trailer, I'm thinking it's going to be a sports movie -- specifically how Mandela recruited one of his country's white rugby players (played by Matt Damon, who gets to show off his specs in the trailer) to form a team that will represent South Africa and win the World Cup. I'm not sure what to make of that. Does it lessen the prestige of the film? Of course, Eastwood could be using the entire rugby theme as a metaphor for Nelson's accomplishments, but if you look at Eastwood's best films -- Outlaw Josie Wells, Unforgiven, Mystic River, Million Dollar Baby, Letters from Iwo Jima -- Eastwood doesn't really mess with metaphors. The film is scheduled to hit theaters Dec. 11.