WASHINGTON — Americans are feeling markedly better about the country’s future and about Barack Obama‘s job performance, but the president’s re-election race against Republican Mitt Romney remains a neck-and-neck proposition as Election Day creeps ever closer, according to a new Associated Press-GfK poll. Buoyed by good mojo coming out of last month’s national political conventions, Obama’s approval rating is back above 50 percent for the first time since May, and the share of Americans who think the country is moving in the right direction is at its highest level since just after the death of Osama bin Laden in May 2011.