Latest update: On Jan. 31 former Maryland congressman John Delaney ended his bid for the 2020 Democratic presidential nomination.

A field guide to the wide array of possible candidates for the 2020 Democratic presidential nomination.

Campaign benchmarks

Most prospects haven’t announced their candidacies. But these indicators can give us clues to who’s thinking about entering the fray.

Iowa visit Have they recently visited Iowa, where the first Democratic contest will be held? Exploratory committee Have they set up a formal committee that allows them to raise and spend money on campaign activities? Included in polls Are political pros and the media beginning to take them seriously as candidates? Recent or upcoming book Whether a memoir or manifesto on economics, a recent book release can indicate a candidate trying to raise his or her profile.

The playing field

Many Democrats are exploring a possible run, reaching out to donors and gauging interest in their potential candidacy. Here's a guide to who's running, who seems interested and who's dropping major hints.

Select a category Top tier Women of Congress Other senators and congressmen From the states Obama alumni City Hall leaders Entrepreneurs

Top tier

These potential candidates have some of the highest name recognition and the most buzz coming into the election cycle.

Women of Congress

Several have stated their interest in running for president, but few have officially announced a decision.

Other senators and congressmen

It’s a long leap from Congress to the White House, but that hasn’t stopped many lawmakers from considering a try.

From the states

Outside Washington, several former and current governors are considering whether to jump into the fray.

Obama alumni

Former Housing and Urban Development Secretary Julian Castro announced his candidacy on Jan. 12, 2019, and former Atty. Gen. Eric H. Holder Jr. has reportedly thought about running as well.

City Hall leaders

No sitting mayor has been elected president, but that's not holding back these potential candidates.

Entrepreneurs

Can a businessman beat Trump — himself a former businessman?