Dutch Uncle
* Tertia Optio * Defend the Constitution
It varies a bit over the decades but 55-60% seems about normal for our age.I don't think that has been true the last two elections. Voter turnout has been much higher than usual and the two parties think it makes a big difference who is elected. Voter turnout was much higher in the 1880s when party loyalty was more intense.
The negative is the cultural divide and intense hatred between the two sides; the positive is that it increases voter turnout.
http://www.electproject.org/national-1789-present
http://www.electproject.org/_/rsrc/1551800206840/national-1789-present/National Turnout Series.png