US Vice President Kamala Harris leads Republican rival Donald Trump by five percentage points in an NBC News poll released on Sunday. Respondents have come to see her more favourably since she emerged as the Democratic presidential candidate. When asked about their views of Harris since she became the nominee, 48 percent of 1,000 registered voters surveyed said they were positive, compared to 32 percent in July—the most significant jump among politician ratings polled by NBC since President George W. Bush’s favourability rose after the 11 September 2001 attacks. Asked about Trump, 40 percent o…