In such a case our duty must be clear to all of us. 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.
The answer is: 3. Johnson defends the right of all people to vote and believes the existing laws are not clear enough for voters to understand them.
President Lyndon B. Johnson addressed to the congress a meeting to discuss the voting right, claiming for equal voting rights, he uses the fifteenth amendment, where after the civil war the right to vote was gave to all the citizens regardless the race or skin color.
