Members of the right-wing Hindu Sena feed cake to a poster of Donald Trump to mark the 70th birthday of the US presidential candidate in New Delhi. Pic/AFP

The US presidential election has taken a curious turn following videos of Democratic candidate and front-runner Hillary Clinton walking to her car — she complained of “overheating” during a 9/11 commemoration in New York — and her knees suddenly buckling. Coming after a steady stream of adverse news, it helped raise her Republican opponent Donald Trump in the polls. Despite her team’s admission of her pneumonia and her scheduled return to the campaign trail later in the week, the video has shaken the voters’ confidence.