2019 has only just begun, but already the Democratic field for 2020 is taking shape.

Massachusetts Sen. Elizabeth Warren on Monday became the most prominent Democrat to make an announcement about a presidential run. Many more will soon follow, possibly including a pair of New Yorkers: Sen. Kirsten Gillibrand and former mayor Michael Bloomberg.

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Bloomberg will make a decision around late January or early February, he said Sunday. He's been vigorously testing the waters, making a trip to Iowa last month in addition to several other early voting states. That's after he very publicly changed his registration to Democrat back in October.

"I think it's fair to say most people liked what we did in City Hall," Bloomberg said on NBC's Meet the Press. "Do I think I could be a good president? Yes. I'm not the only one that could be a good president."

It's a race that will get very crowded, very quickly, with a number of high-profile Democrats weighing a run. As recently as late October, Gillibrand insisted she was not among them, pledging in a televised debate to serve out her entire six-year Senate term.

That changed quickly after Election Day. "I'm definitely thinking about it," Gillibrand said last month, saying she'd discuss it with her family over the holidays.

Gillibrand, who won re-election in a landslide with 67 percent of the vote, has the advantage of being a prodigious fundraiser. She, too, has recently traveled around the country, campaigning on behalf of female candidates in the midterms.

Bloomberg, who gave $110 million to Democratic House candidates, has an immense financial advantage over the rest of the field, and has a 12-year record as mayor to point to.

"I got elected in New York City, an overwhelming Democratic city, an overwhelming minority city," he said on Meet the Press. “And I got elected three times. So I must know something about this."