FOX News First: September 12 By Chris Stirewalt Buzz Cut: · Battleground poll shows Dems down by 18 points · Amnesty anxiety grows · Clintons going big in Iowa to avoid repeat of '08 defeat · Still tight in the Tar Heel state · Nanna, please stop tagging The Grandmaster BATTLEGROUND POLL SHOWS DEMS DOWN BY 18 POINTS If this week's polling is any evidence, Democrats are facing an even tougher road come November. With President Obama 's approval sinking below former president George W. Bush 's, the latest Fox News poll finds Republicans hold the advantage as they seek to reclaim the Senate. In states with active U.S. Senate races, likely voters say they would back the Republican a 9-p...