"Here are the Senate seats that will be critical in 2020" PBS NewsHour 8/16/2019

Excerpt

SUMMARY:  While nearly two dozen candidates are competing for the 2020 Democratic presidential nomination, that party is facing the opposite predicament in the Senate: not enough top-tier candidates are running, in part because many strong contenders are in the presidential race instead.  Lisa Desjardins reports on the 2020 Senate races that could change the party power balance in the Senate.