The recent Pennsylvania Supreme Court election not only changed the partisan makeup of the state’s high court, but political observers say it likely changed the course for future state judicial elections.

With three seats on the state’s high court at stake, the 2015 Pennsylvania judicial election was the most expensive election in U.S. history. Total documented spending was nearly $16 million by Election Day, according to an analysis by nonpartisan organizations Justice at Stake and the Brennan Center for Justice.