Your plot has 0-100% on the X axis, but only 0-10% on the Y axis. Also if you assume an equal % of Republican share and Trump share % then it would be a straight line at y = 0. Your data itself has a downward trend in that you start with 10% more Trump share on x = 0, and end with 5% less Trump share linearly at X = 1
Your plot has 0-100% on the X axis, but only 0-10% on the Y axis. Also if you assume an equal % of Republican share and Trump share % then it would be a straight line at y = 0. Your data itself has a downward trend in that you start with 10% more Trump share on x = 0, and end with 5% less Trump share linearly at X = 1