Midterms tend to be backlash elections, and the president's party almost always loses seats when voters return to the polls to judge his performance in office.
But not all midterms are created equal.
On Tuesday, Democrats comprehensively routed their Republican rivals, regaining control of the U.S. House, U.S. Senate and statehouses across the country. Along the way, they shattered a series of decades-long Republican winning streaks and notched several historic firsts.
So just how big was this year's blue wave (or "blue tsunami")?
The full scale and scope of the Democratic Party's seismic victory is still coming into focus as officials tally every last vote. But here are some key numbers to help you put it into perspective:

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