Voter turnout will be high in 2020. We don't really know what that means yet

It matters which groups are more likely to vote relative to 2016. Not all increases will be uniform

When you need crosstabs and a pollster won’t give them to you:

The Takeaway: Vote turnout in 2020 will hits levels not seen for decades. Many analysts assume this will help Democrats, but if you dig into the data, there are many scenarios in which the increased salience of the next election might actually help Republicans. The aggregate numbers obscure the real picture; it’s all about which groups are actually engaged.