Bernie Sanders Tops U.S. Poll; Bloomberg Overtakes Warren in Third Spot

(Bloomberg) -- Bernie Sanders is leading the Democratic field and Joe Biden has lost his front-runner status in a national poll taken after the Iowa caucuses.The Quinnipiac University poll showed the Vermont senator with 25% support, topping the survey for the first time. He was followed by Biden at 17% and former New York City Mayor Michael Bloomberg at 15%.Biden dropped dramatically since the previous Quinnipiac poll on Jan. 28, when he had 26% and the lead. In that poll, Sanders was second wi