The Daily Show carried Al Sharpton's "40 acres and a mule" speech. So did Tough Crowd with Colin Quinn. One of Quinn's guests insisted that this is in the Constitution. For those who aren't sure, here is the Amendment.

Article XIII.

Section 1. Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction.

Section 2. Congress shall have power to enforce this article by appropriate legislation.

Not there. Maybe she was thinking of the 15th Amendment.

Article XV.

Section 1. The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State on account of race, color, or previous condition of servitude.

Section 2. The Congress shall have power to enforce this article by appropriate legislation.

Still not there. She called it the 16th Amendement. Let's check that one.

Article XVI.

The Congress shall have power to lay and collect taxes on incomes, from whatever source derived, without apportionment among the several States, and without regard to any census or enumeration.

Somehow, I don't think that this is what she meant. You can find all of the Amendments here. The Constitution itself is here. Read it for yourself.