An interesting bipartisan organization that has been pushing for the popular vote for many years is called National Popular Vote:
http://www.nationalpopularvote.com/
I happen to know about them because its founder happens to be a very famous computer scientist in my area of research, John Koza. When I was a grad student, Koza’s first book on Genetic Programming had just come out (he wrote four). I saw him give technical talks three times, including when he was a guest at our university. Super nice guy who took time with our undergrads and left them quite excited about AI. Koza has in recent years pretty much stopped doing his computer science work to focus on state-by-state popular vote efforts.

There was a wonderful in-depth debate between Koza and James Hulme just two months ago, on c-span. Hulme starts strong, but as it goes on, Koza’s arguments get more and more compelling:
https://www.c-span.org/video/?419679-3/washington-journal-roundtable-electoral-college