The relationship between bias and swing ratio in the Electoral College and the outcome of presidential elections

In this paper, I assess how the outcomes of presidential elections are affected by the presence (or lack) of partisan bias in the Electoral College. There have been three instances (1876, 1888 and 2000) since the end of the Civil War where the party that lost the popular vote won the Electoral College. These instances raise the question of whether partisan bias consistently influences presidential election outcomes? I answer this question by first measuring partisan bias and then using these estimates to assess how partisan bias affects a party's odds of winning a presidential election. I find that the presence of partisan bias provides a sizable, but not insurmountable, obstacle for the disadvantaged party.