Chris Christie say he has finally made a definitive decision, once and for all, not to run for president in 2012, sources close to the New Jersey governor told Fox News on Tuesday. Despite the intensity that has heightened in recent days as the New Jersey governor prepares to deliver a speech Tuesday at the Ronald Reagan Presidential Library, several people close to the governor insist he has not changed his mind to forego a presidential bid. Christie is on tour, attending seven fundraisers in three states, which has fueled speculation that he could be preparing for a 2012 bid....