Jonathan T. Soros has this interesting analysis of the causes of partisanship in the United States. He discusses gerrymandering, top-two primaries, and Instant-Runoff voting. Soros is a senior fellow at the Roosevelt Institute and a co-founder of Friends of Democracy, a PAC that attempts to counter the influence of large amounts of money in campaigns. He is a son of George Soros. Here is a piece he and Mark Schmitt wrote earlier this year about the idea that the right to vote should be explicitly mentioned in the U.S. Constitution. Thanks to Rick Hasen for the link.