Charlie,
Every one of the aforementioned Anti-Semite Democrat politicians left office on their own volition (or in Mckinney’s situation by voters decree.)
None of them were marginalized by the Democrat Party. As long as they remained in office, they were honored and welcomed by the Democrat Party, and by the various Democrat Congressional Caucuses.
And Anti-Semites Sharpton and Jackson, who have both run (and lost) for elected office on the Democrat line, too were AND ARE long honored and welcomed by the Democrat Party.