Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.
One of the most divisive issues today is Marriage Equality and both sides wanting government to legalize certain marriages or define marriage. Both sides are wrong; in that they want Government to define what is or is not marriage.
For thousands of years marriage has been a religious ceremony. Nearly every religion and culture has traditions, doctrine and scripture that set forth their guidelines for that institution.
As a Libertarian I believe individuals are free to make their own choices, so long as their choices do not infringe on the rights of others. Though I hold strong beliefs and convictions as a Christian, I have no right to force upon another through legislative action my personal theological beliefs about any issue. The Constitution is clear, Congress can make no law respecting an establishment of religion or any law that would prohibit the free exercise of religion.
Again, the Constitution is clear and concise. Congress has no authority in defining what is and what is not marriage. By definition, any decisions concerning Civil Partnerships or Domestic Partnerships classification should be left to the States or people as defined in the 10th Amendment.