Every man and every woman in this Nation - regardless of party - who have the right to register and to vote, and the opportunity to register and to vote, have also the sacred obligation to register and to vote. For the free and secret ballot is the real keystone of our American Constitutional system.

–President Franklin D. Roosevelt,
1944

Which statement best summarizes the main idea of this quotation?

The Constitution requires all citizens to vote by law.
Citizens uphold our system of government by voting.
Men and women should not bother to register to vote.
All votes should be carried out by a secret ballot.