Democrats rode a wave of discontent -- both for the economy and President Donald Trump -- and gained control of the Senate once again, making gains in places that just two years ago would have been unthinkable.

Kansas, South Carolina, Iowa are just a few of the Republican strongholds where insurgent Democrats not only won but did so with notable margins - with notable shifts in key demographic groups and voting blocs.

Here's how we got here: Democrat Jon Ossoff is projected to win reelection to the U.S. Senate, according to ABC News Voter Polls.