Yahoo News Explains: Possible Democratic presidential challengers for 2020

The 2020 presidential election is fast approaching, and there have been plenty of whispers in Washington about who’s running.

Preliminary polls have former Vice President Joe Biden leading any other candidate by a large margin. “I don’t think about the polling data. I think about whether or not I should run based on very private decisions relating to my family,” he said in a CBS interview.

The 75-year-old also acknowledged that people were likely to judge him on his vitality if he ran.

In 2016, Hillary Clinton became the first female nominee of a major political party. Would the second time be the charm?

California Sen. Kamala Harris has been taking to the campaign trail to help local Democrats in the midterms. When she arrived in South Carolina, the audience chanted, “Madam President!

Similarly, New York Sen. Kirsten Gillibrand visited the crucial swing State of New Hampshire.

Many speculated that Massachusetts Sen. Elizabeth Warren was planning to run after she released a DNA test, following ridicule from President Trump. This could help defuse any attacks he could make about her then questioned Native American heritage.

Related: Yahoo News Explains: Does Trump owe Sen. Warren $1 million?

New Jersey Sen. Cory Booker helped Democrats campaign in Iowa, a state where campaigning almost always signals a run for president.

Vermont Sen. Bernie Sanders also visited the pivotal state, criticizing Trump about health care.

“He said as a candidate, ‘If I am elected president, I’m going to bring health care to everybody.’ Remember that? He lied,” said Sander at a rally.

Billionaire Michael Bloomberg and lawyer Michael Avenatti could be rogue candidates who could take on the president.

Bloomberg has no shortage of cash to campaign, and Avenatti has a way of out-Trumping Trump — at least on Twitter.

Whoever runs, it’s becoming evident that the 2020 presidential election is shaping up to be a historic one.