With the midterm elections over, speculation has already turned to who is likely to make a presidential bid in 2020.

The field of potential Democratic candidates is crowded, while no Republican has emerged so far as likely to challenge President Donald Trump.

As the contenders emerge, Democrats will be considering the lessons from the midterm's victories, losses, and surprises.

The record number of women elected to Congress — as well as polling that shows all of the most likely women to run would beat Trump — will also be on Democrats' minds.

The race has recently seen some big developments. Attorney Michael Avenatti announced that he will not run, despite stoking speculation for months. Former Democratic Gov. Deval Patrick of Massachusetts is expected to say he will not launch a 2020 presidential campaign.

Here are the most likely 2020 presidential contenders.

Donald Trump

Trump filed the paperwork to run in 2020 just hours after he was inaugurated in 2016.No Republicans have announced their intention to run against him, though there has been speculation of an anti-Trump GOP insurgent campaign.

Republican Senate Majority Leader Mitch McConnell said in October that he believes it would be a "waste of time" for any Republicans to try.

Joe Biden

Biden said that he is talking with his family about whether he will run for president, and he

Biden fueled speculation when he said at the start of December that he believes he is "the most qualified person in the country to be president."

"The issues that we face as a country today are the issues that have been in my wheelhouse, that I've worked on my whole life," he said.

Bernie Sanders

The 2016 Democratic runner-up is expected to run in 2020, though he has not confirmed his intentions.

In August, he won the Democratic nomination in Vermont's Senate primary, but he turned it down, further fueling speculation.

Sanders has repeatedly said that he will run again only if he believes he is the best candidate to defeat Donald Trump.

A group of former Sanders staffers is forming a new group, "Organizing for Bernie," with the aim of building a structure that could let the senator start to campaigning with a moment’s notice.

Beto O'Rourke

O'Rourke met with Obama in his Washington offices in November, stoking further speculation.

Kamala Harris

a tough opponent

Michael Bloomberg

The billionaire former New York mayor is exploring a run for the presidency.He was first elected mayor as a Republican, then later re-elected as an independent, but financially supported Democrats during the midterms and officially registered as a Democrat in October.

He said in a radio interview in December that he is likely to sell his company if he runs for president, fuelling further speculations about the likelihood of his candidacy.

Hillary Clinton

A former senior aide to Hillary Clinton said in October that there was a "not zero" chance she could decide to run for president again.

Amy Klobuchar

Democrat Senator Amy Klobuchar's name has been floated for the party's presidential nomination after her landslide win in Minnesota in the midterms.

Political commentators said she could be a serious contender after she performed well in rural counties that Trump carried to earn his surprise victory in 2016.

On Tuesday, Klobuchar told MSNBC she was "considering" a run for president.

Kirsten Gillibrand

New York Senator

Elizabeth Warren

Trump reportedly thinks Warren will be his 2020 opponent.Warren said in September that she would consider running "after the midterms."

Andrew Gillum

Gillum attracted national attention when he stunned Florida by beating wealthy primary opponents and waged an aggressive and deeply progressive campaign for governor against Trump-endorsed Rep. Ron DeSantis.

Gillum met with Obama in December, according to reports, although Gillum has declined to elaborate on his thoughts about a presidential run.

"I plan on being married to my wife. That is all I am planning," Gillum said in response to questions about 2020.

Cory Booker

The New Jersey senator is regularly mentioned as a potential candidate and gained popularity and name-recognition among many liberals for his opposition to Supreme Court nominee Brett Kavanaugh.Booker has placed staff on the ground in Iowa, the Guardian reported.A CNN poll n October

Eric Swalwell

The 37-year-old California congressman is "definitely running," a source told Politico in November.

John Delaney

Julian Castro

Tulsi Gabbard

The Hawaii congresswoman

Tim Kaine

Kaine, Hillary Clinton's vice presidential pick in 2016, is considered a 2020 prospect. He was re-elected as Virginia senator in the midterms.

Steve Bullock

The Montana governor gave a speech in August that touted his ability to win in Trump country, sparking speculation of a potential 2020 run.

Terry McAuliffe

Eric Garcetti

The mayor of Los Angeles hinted at a run in 2017, and said that he was "

Jeff Merkley

The Oregon senator said in June that

John Hickenlooper

The Colorado governor told Politico he is considering a 2020 run, adding that he has seen

Tim Ryan

The Ohio congressman has been telling

Jay Inslee

The Washington state governor said in October that at he is "not ruling out" a presidential run.

Sherrod Brown

The Ohio senator said in early November, "undits say is just too hard for a progressive Democrat."

"We celebrate the worker. And that is the blueprint for America in 2020," Brown said.

Mark Cuban

The billionaire is an unabashed Trump critic and has teased a 2020 run in the past, and polls have shown he could give Trump a run for his money.

At Business Insider's annual IGNITION conference on tech and media in December, he said it would be "bad parenting" to run for president in 2020, but he suggested he might go for it regardless.

But he might not end up challenging any Democrats — in November 2017, Cuban said he would run as an independent if he were to mount a campaign.