By the way, anyone can play around with the Tradesports numbers and charts here (without an account and without betting):
https://www.tradesports.com/aav2/trading/tradingHTML.jsp?evID=23190&eventSelect=23190&updateList=true&showExpired=false
Click on the names of nominees and another window will popup with interesting price charts going back more than a year, so you can see how each "candidate" has fared over time.
Over on the left menu, you can reach a similar chart for Republican candiates.