I am paraphrasing the Congress site on this issue.
As far as liberal, look in the mirror. If you are for things most people know is wrong from simple ethics, you are a moral liberal. Such as in your stance on drugs as I have read you.
No matter how you refer to the Constitution, it was written in the 1700s to serve the beginning of our country. It was the beginning and cornerstone of where we started. Nobody knew the future in the 1700s to create the perfect Constitution that could fully serve all future needs. It was determined to handle it as the country has. As I stated, at times it looks like a yoga move in their interpretation, but I can see where how they handle it is not that bad compared to 13,000 amendments.