“Haley continuing to garner support after suspending her campaign may indicate that a significant number of normally loyal Republicans are not supportive of Trump,” Grant Reeher, professor of political science and director of the Campbell Public Affairs Institute, tells USA Today.

“Whether that means they will vote for Biden or another candidate in the general election is, again, hard to say, but it could indicate that some of them may not vote, given the options.  And this election is expected to be close, so even a small drop-off could hurt Trump, especially in the battleground states,” he adds. 

In the USA Today article “Trump said he has 'no problem' debating Robert F. Kennedy Jr. Here's why,” Reeher says that Kennedy has also downplayed the Jan. 6, 2021, attack at the Capitol, and both Biden and the Democrats have been making a lot of that moment by pushing themselves as the "party of democracy.” 

Kennedy's participation "could undercut that central message of Biden,” Reeher says.