The Constitution says that no person shall be kept from voting because of his race or his color. We have all sworn an oath before God to support and to defend that Constitution. We must now act in obedience to that oath. There is no constitutional issue here. The command of the Constitution is plain. There is no moral issue. It is wrong–deadly wrong–to deny any of your fellow Americans the right to vote in this country. There is no issue of States fights or national rights. There is only the struggle for human rights.

The American Promise (1965)