NASHVILLE, Tenn. -- Newt Gingrich has closed the gap in Tennessee and is poised to overtake those presumed to be the victors in the delegate rich state just days ago. Real Clear Politics' tracking of the polling done across the weekend shows the We Ask America numbers putting the state in a statistical dead heat with Romney at 30%, Gingrich at 29% and Santorum at 29%. The margin of error is 3%. Likewise, PPP polling has Santorum at 34%, Romney at 29% and Gingrich at 27% The significance is these polls were taken on March 3rd and 4th. Earlier polling,...