Superdelegate Davis slow to endorse Obama By John Rodgers, jrodgers@nashvillecitypaper.com Updated: Friday, June 13, 2008 2:33 am The rise of Sen. Barack Obama, to become the Democrats’ presidential nominee has put most of his party’s faithful on his bandwagon — but not Lincoln Davis, a rural Tennessee Congressman with gubernatorial ambitions. Davis (D-Pall Mall) is not yet endorsing the presumptive nominee in Obama, saying he’ll wait until the late August Democratic Party national convention. In Davis’ sprawling 4th Congressional District — which ranges from as far west as Hickman County to as far east as the upper Cumberland Plateau —...