I was going to say this, the way Biden is handling the border crisis is turning a lot of NYC, Chicago, and Denver voters off (and more, those are just hit pretty hard lately.) EDIT: Check out the mayor of NYC's polling numbers. They are the lowest since polling began. It is the worst administration in NYC's history because of the migrant crisis handling. I can confirm with links but not sure what good that would do if people have made up their own minds.
Those are all areas in states that are safe Democratic in the Electoral College. It's worse if it turns off Democrats in swing states who may not show up on election day.
Without commenting on the situation itself, I feel like sentiments toward it might indeed be hurting his numbers now but won't have any significant impact 22 months from now. American voters have short memories when it comes to things that don't materially affect them.