The Democrats are taking aim at Maine’s two-term Republican congressman, Bruce Poliquin, with an advertising blitz that got underway Thursday. The Democratic Congressional Campaign Committee assailed Poliquin and 10 other GOP lawmakers it considers vulnerable in the wake of a House vote in May for a failed health care overhaul that critics said would have stripped millions of their coverage. Poliquin isn’t fretting about it. “Congressman Poliquin has had literally millions of dollars in false attack ads spent against him for years and he remains focused on one thing: serving the people of Maine,” his consultant, Brent Littlefield, said Thursday. Democrats, though, say this time around things may go better for them, pointing to national polls that show deep dissatisfaction with GOP efforts to dismantle existing health care programs and a lack of support for Republican President Donald Trump, who is leading the effort. Cole Leiter, a spokesman for the group, said Poliquin, who represents Maine’s sprawling 2nd District, said the congressman is “another political dimension” from other GOP legislators under fire because U.S.