Former President Donald Trump lost six percentage points of support in a national tracking poll after skipping last week’s first Republican primary debate, though the 77-year-old is still well clear of the rest of the GOP field.An even 50% of likely Republican primary voters backed Trump in the Emerson College survey out Monday, down from 56% in the poll the outlet released Aug. 19, four days before the showdown at Milwaukee’s Fiserv Forum. Florida Gov. Ron DeSantis gained two percentage points from the previous poll and placed second behind Trump with 12% support. Following the top two were entrepreneur Vivek...