Three likely 2020 Democratic presidential candidates continue making moves to distinguish themselves from the pack. Another formally declared candidate continues actively campaigning, while still another contender is headed to New Hampshire this weekend.

U.S. Sen. Cory Booker, D-N.J., headlined a New Hampshire Democratic Party event in Manchester on Saturday, while he also spent some time in Nashua. Prior to becoming a senator in 2013, Booker, 49, served as mayor of New Jersey’s largest city: Newark.

Tuesday, Booker welcomed the announcement that bipartisan legislation changing the nation’s sentencing laws would get a Senate floor vote this month. He played a key role in talks on the bill.

Another probable contender is U.S. Sen. Kamala Harris, D-Calif. Before becoming a senator in 2017, Harris, 54, served six years as California’s attorney general.

After Republicans won a net gain of two Senate seats in last month’s midterms, Harris faced a possible eviction from the powerful Judiciary Committee. That would have dealt a setback to Harris, who has gained a Democratic following by using her post on the committee to aggressively question President Donald Trump’s judicial nominees.

However, Senate Minority Leader Chuck Schumer, D-N.Y., tweeted on Tuesday the “good news” that Harris would keep her spot.

U.S. Sen. Elizabeth Warren, D-Mass., need not travel far from her home to campaign in the New Hampshire primary, if she ultimately chooses to do so. Published reports indicate Warren, 69, already has $12.5 million and a “massive email list” at her disposal. She is also reportedly looking for presidential campaign headquarters space in the Boston area.

Meanwhile, outgoing U.S. Rep. John Delaney, D-Md., 55, is a formally declared candidate who continues making trips to New Hampshire to meet with potential voters.

Finally, U.S. Rep. Eric Swalwell, D-Calif., is scheduled to make another visit to New Hampshire this weekend. At 38, some may say Swalwell is too young to seek the office, but he is reportedly giving it serious consideration.

Keep in mind, however: these are but five of about three dozen potential Democratic contenders for 2020.