The Democratic field for the 2020 Presidential nomination is now at 22 and counting.

There may be a reason for this high number of candidates who may otherwise continue their jobs in the U.S. Senate.

Apparently being in the Senate isn't all that wonderful.

Three candidates in key states have chosen presidential bids over re-election to the Senate.

To find out more, KCBS Radio news anchors Jeff Bell and Patti Reising spoke with Jack Pitney, Professor of Government Studies at Claremont McKenna College in Southern California.