So why did they choose Obama in 2008 and 2012 and then chose to revert back to voting for the GOP? The 31 point deficit in favor of GOP congressional candidates is quite stunning.
This could mean that the Obama Coalition, especially in the Midwest and some parts of the Northeast, were heavily reliant on cross over voters who hailed from the decades long Reagan coalition. If that is the case then 2020 could very well be a victory for the GOP if these voters stay in their column and the Democrats fail at bringing the youth and minorities out to vote.
In 2008 the Financial crisis happened which explains most of the Bush-Obama voters. By 2016 because of Trump's rising popularity in the midwest compared to other GOP candidates he was able to sway most of them to come back.
