I gather from your contempt that Byrd must be a Democrat.
Indeed Byrd is a Democrat, the oldest and well respected member of the senate, respected by both Republicans and Democrats. He has won reelection to Senate countless times. He is President Protem of the Senate.
He put the KKK episode to rest a long time ago, it is only extremists like YJ who bring it up, even most Republicans don't bring it up. When he is up for election, he gets most of the black votes, as does any Democratic candidate against any Republican.
If blacks have forgiven him, the episode is over as far as I am concerned, regardless of what the right wing extremists may think.