The list of candidates looking to become the next president of the United States continues to grow and in such a way that it could make things more difficult for President Joe Biden. 

This is according to a new report from Fox News.

Before going too far, it ought to be noted that Biden and former President Donald Trump continue to dominate their respective parties' primary races. Trump is up by over 44 percentage points, while Biden is leading by over 65.

So, at this point, it seems clear that 2024 will be a rematch of the 2020 general election matchup between Trump and Biden.

But, what Fox's report focuses on is third-party and potential third-party candidates as well as how they might make victory more difficult for either Trump or Biden.

Perhaps the most influential third-party candidate thus far is Robert F. Kennedy Jr. Recent polling indicates that he is polling at about 10% of the vote in swing states. But, it is looking as though Kennedy is taking just about as many votes away from Trump as he is taking away from Biden.

Different candidates could potentially have different effects on the outcome of the 2024 election.

Last week, Jill Stein announced that she will be making another run for the presidency. The reader may remember that Stein ran in the 2016 presidential election as a Green Party candidate. And, some argue that she played a big role in Trump's election that year.

The question now is whether Stein might spoil the Democrats' chances again in 2024.

Then, according to Fox, there is the potential third-party candidacy of U.S. Sen. Joe Manchin (D-WV). Manchin recently announced that he will not be running for reelection next year. And, he seems to be floating the possibility of a presidential run.

Recently, in fact, Manchin announced that he is planning a cross-country trip to see "if there is an interest in creating a movement to mobilize the middle and bring Americans together."

There is a very real possibility that, should Manchin run, he, too, could take votes from Biden.

Polling suggests that Biden already has a difficult road to victory in 2024, even without these complications from third-party and potential third-party candidates. Real Clear Politics, for example, has Trump leading Biden, on average, by 1.1 percentage points - and, significantly, this lead has been growing. Trump, in fact, used to trail Biden.

Nonetheless, Biden has tried to make it clear, publicly, that he is not worried and that he fully expects to win in 2024.