Written by Jonathan Weisman For some audiences, Vivek Ramaswamy is a biotech entrepreneur who pushed for pharmaceutical breakthroughs before he tried to break into politics. For others, he is a cultural warrior battling “woke” corporations or a crusader for his definition of “truth,” whether it be the sanctity of two genders or the perpetuation of fossil fuels. The identity that the entrepreneur and Republican candidate for president has kept more or less under wraps since his undergraduate days at Harvard University is another thing entirely, Da Vek the Rapper. Yet there it was at the Iowa State Fair this month,...