Ten Commandments Defense Act of 2003 - Declares the following : (1) that the power to display the Ten Commandments on or within property owned or administered by the several States or their political subdivisions is among the powers reserved to the States respectively (under the Tenth Amendment of the U.S. Constitution); (2) that the expression of religious faith by individual persons on or within property owned or administered by the several States or their political subdivisions is among the rights secured (under the First Amendment) against laws respecting an establishment of religion or prohibiting the free exercise of religion made or enforced by the Federal Government; and (3) that the expression of religious faith by individual persons on or within property owned or administered by the several States or their political subdivisions is among the liberties of which no State shall deprive any person without due process of law made in pursuance of powers reserved to the States respectively.