At present it's quite unclear who that electable Democrat might be.
The Atlantic has an excellent article on its website that lists all contenders of both parties. I immediately dismiss Bernie Sanders and Joe Biden because they're too old. Whatever their positives may be, the nation doesn't need another forgetful geriatric with his hands "on the button", as was the case in the last years of Ronald Reagan's presidency.
At this point I am intrigued by Amy Klobuchar.
- She has a strong educational and professional background,
- she's been in the U.S. Senate long enough to know how Washington works,
- she takes positions that appeal to unaffiliateds,
- she's good under pressure (according to the Kavanaugh confirmation hearings),
- she demonstrated good political judgment by becoming an early adopter of Barack Obama in 2008, and
- aside from complaints that she's difficult to work for, she's kept herself very clean through 20 years of elected office.
As for the others identified by The Atlantic — Kamala Harris, Pete Buttigieg, Julián Castro, John Delaney, Tulsi Gabbard, Kirsten Gillibrand, Andrew Yang, Marianne Williamson, Cory Booker, John Kickenlooper, Jay Inslee, Mike Bloomberg, Steve Bullock, Sherrod Brown, Eric Swalwell, Terry McAuliffe, Tim Ryan, Seth Moulton, Beto O'Rourke, Michael Bennet, Stacey Abrams, Bill De Blasio, Eric Holder, Mitch Landrieu, Andrew Cuomo, and Eric Garcetti — I don't see a potential winner, although it's early yet.
And please don't mention Hillary Clinton.