GREENSBORO — Hillary Clinton got back on the campaign trail on Thursday after taking three days off for pneumonia, and the Democratic presidential candidate faced a more challenging political landscape, with Republican rival Donald Trump rising in opinion polls.Senior Clinton aides said they always expected the race to the November 8 election to be close. But it was clear from a raft of new polls that Trump had halted a summer swoon after taking steps to deliver a less freewheeling, more polished performance on the stump.Clinton, 68, appeared in good health on a visit to the press section of her campaign plane while flying to Greensboro, North Carolina, for a rally where she sought to refocus her campaign on the plight of the working class."I want you to think with me for a minute about how I certainly feel lucky when I’m under the weather I can afford to take a few days off," she said. "Millions of Americans can’t."On Sunday, Clinton nearly collapsed at a ceremony marking the Septe...

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