“It’s currently, post gunshot, a 2% Trump lead.”
You need to do some research on who did that poll before you take it as gospel.
The only really important thing about polls is what their previous ones read.
It doesn’t matter what their sample is. What matters is if there is any indication that sample is changing within it over time.
Reuters/Ipsos 2 days ago read T+2. In late May it read tie.
So after the debate and after the gunshot, only 2% moved.
This is not enough to compel anyone dropping out, especially with Biden yet to have a convention bounce.
People don’t care about Biden. They hate or love Trump.