Donald Trump’s running mate is less popular with American voters than Sarah Palin was as she ran alongside Sen. John McCain, polls and analyses show. FiveThirtyEight, an aggregator of national polls, found this week that Vance’s net favorability has plummeted six points from -3.3 percent on July 18 to -9.3 on Wednesday, Aug. 14. A New Republic analysis declared Thursday, “Vance is possibly the least popular vice presidential candidate of the 21st century.” Want more breaking political news? Click for the latest headlines at Raw Story. Vance’s unfavorably numbers jumped more than 13 points in l…