Donald Trump‘s presidential nomination and the tea party trend of earlier this decade have led to plenty of thumb-sucking when it comes to the Republican Party‘s alleged shift toward the political extreme. And there is certainly evidence for that.

But a new Pew Research Center study shows that Democrats are also evolving quickly. And if anything, Democrats have actually shifted more over the past two decades on many key social and philosophical issues, trending relatively quickly toward liberal positions as Republicans have changed more slightly.