Back in my day a Red Line was what everyone wanted.
The message being driven home is that the Democrats do nothing for those minorities. That POTUS administration will benefit them more than previous ones. This is intended to mitigate the "old white male" propaganda point.
Quite simple really.
If you were to ask him about race quotas he would tell you he's against them because we're all the same.
o7
That's what everyone wanted right before the whole BMX craze brought us chromoly frames, forks, light weight rims. It was glorious.