Why you shouldn't care so much about the popular vote

(CNN)One interesting factoid in the 2018 midterm election hangover is that Republicans were able to substantially build on their Senate majority (by at least two and up to five seats) despite the fact that many millions more Americans voted for a Democrat for Senate this year.

Most electoral maps, including CNN's, do not include a popular vote total when looking at cumulative Senate races, but The New York Times does.
And the numbers are enough to send Democrats, despite winning control of the House of Representatives, crying into their post-election cereal bowls.