WASHINGTON -- The Democratic presidential field is filling out with most of the big names now in the race, including former Vice President Joe Biden who announced his candidacy on Thursday. Biden currently looks like the front-runner, but as it's just April, it’s still too early to tell in a presidential race that promises to be unpredictable.

• Joe Biden Ends Speculation, Announces His Run for President

Despite Biden and Vermont Senator Bernie Sanders topping most polls, Georgetown University political expert Michele Swers believes that candidates like California’s Kamala Harris and Eric Swalwell still have a chance because a lot can change in the next few months.

Swers said Harris is a Senator who is well-known, invited onto shows, and who has received a lot of exposure due to the part she played in the Brett Kavanaugh confirmation hearings.

Swers says Swalwell has his own strengths. He’s on both the Judiciary and Intelligence committees, so he’ll know a lot when it comes to Congress’ business with issues like the Mueller probe and policies related to Russia.

But Swers does believe that Biden has the strongest overall name recognition and although he considers himself a moderate Democrat, she believes he is also progressive and can appeal to a large group of voters.

“He rode the Amtrak train home every weekend to Delaware, so he is someone who will rely on his ability to connect across groups of voters,” said Swers.

“And he was very involved in the creation of the Violence Against Women Act in the first place, so I think that he’s had some recent issues with some people saying that he made them feel uncomfortable with touching, but he’s long also been a champion related to domestic violence.”

Trump also weighed in on Biden’s announcement, taking a jab at the former VP’s intelligence, tweeting: “You will be dealing with people who truly have some very sick and demented ideas, but if you make it, I will see you at the starting gate!”

It's undeniable that Biden is looking like a strong candidate. As of now, the former VP polls far ahead of the others, with an average approval percentage of around 28 percent, putting him above Sanders with around 20 percent, according to Politico.