The Graying Of Senator Obama's Hair

Recently, it was pointed out that Senator Obama's hair is showing some gray. There are two possible explanations: (1) The stress of running for president is causing the graying. (2) He has been graying for some time, but has been using dye to cover it up, and he has stopped doing so. Why? Perhaps he wants to attempt to neuter the belief among some that he is too young to be president. Having some gray hair adds age and maturity.