If I remember correctly, at her graduation from college Hillary was the valedictorian and Edward Brooke was on the podium, the only black member of the US Senate...and she verbally attacked him in her remarks.
It does sound like Edward Brooke never got the respect he craved from Democrats, but he refused to switch parties. There is an office building named for him in Boston, but I can’t recall if it is a federal building, probably is.