Cory Gnazzo, senior producer for the Rachel Maddow Show, shares a preview of tonight's show - New Jersey Gov. Chris Christie announces that he will not add his name to the list of presidential candidates this year - so where does that leave the rest of the field? Plus, AFL-CIO president Richard Trumka is on the show to discuss the reasons why companies aren't hiring, and we spotlight the fight in Colorado over voting rights, with help from a special guest.Oct. 5, 2011