Sen. Cory Booker is considered a rising star for the Democrats. Reuters

After Democrats finish licking their wounds from the unexpected loss Tuesday to now-President-elect Donald Trump, they’ll have to start on the long road to 2020 when they’ll have a chance to reclaim the White House.

If you’re wondering who might make a run for the Democratic nomination in four years, here’s a quick list of potential candidates, many of whom sat on the sidelines in 2016 because Hillary Clinton seemed like such an inevitable choice.

Sen. Cory Booker (New Jersey) Booker, 47, has a compelling background that includes rescuing a woman from a burning building and going out of his way as the Mayor of Newark to shovel a resident’s driveway after a snowstorm. Booker, who is up for Senate re-election in 2020, was reportedly on Clinton’s short list to be her running mate and has a reputation as a reformer. The Rhodes Scholar has a likable personality and will have plenty of experience by 2020.

Sen. Sherrod Brown (Ohio) Brown is another Democrat who leans left of the party. The raspy-voiced labor advocate isn’t talked about quite as much as Elizabeth Warren or Vermont Sen. Bernie Sanders (who doesn’t make this list because of his age) but may be just as appealing to Democrats as either of them. There was some talk before the 2016 Democratic primary as to why progressives weren’t “begging him” to run. He's popular in Ohio, a crucial swing state.

Julian Castro (Texas) Castro, 42, received consideration over the summer to serve as Clinton's running mate. He has been the U.S. Secretary of Housing and Urban Development since 2014. As a Hispanic politician from Texas, he will have a good chance to rally a crucial voter demographic. The former San Antonio Mayor has an identical twin brother, Joaquin.

Gov. Andrew Cuomo (New York) Cuomo has tried to position himself as the face of progressive politics as the governor of New York State, endorsing a $15 minimum wage, gay marriage, among other measures. Still, he’s been criticized for economic and budget stances like cutting taxes for the wealthy, which may hurt his chances in a theoretical 2020 run.

Sen. Tim Kaine (Virginia) As Clinton's running mate, the former governor of Virginia has immediate name appeal and comes from a state that is pivotal for his presidential hopes. Kaine, 58, also speaks Spanish, which is important considering Latinos are still an important voter bloc and may be even more crucial in 2020. But Democrats may prefer a candidate with less political experience.

Sen. Elizabeth Warren (Massachusetts) Warren is commonly brought up as a strong candidate because she has relentlessly fought against Wall Street and has proven herself to be an effective campaigner this year, attacking Trump on behalf of Clinton. She’s beloved by the left, like Sanders, but at 71 years of age in 2020, would be the oldest elected president in history. Meanwhile, Massachusetts nominees have had poor success, with Michael Dukakis, John Kerry and Mitt Romney all falling short.