Greenspan "May Not Vote in 2008"

Former Federal Reserve Chairman Alan Greenspan was quoted as saying "he may not vote in 2008".What has happened to him? What is his reasoning?

He was the chairman of the Fed for 18 years. He retired in 2006.Greenspan has just published a memoir criticizing President Bush and Congress.

With many politicians now bowing out of the 2008 races, I wonder how am I, the average person supposed to vote? We see politicians saddened about the state of affairs and dissolutions of their own political systems.