Who is the Preamble written for?
The Preamble was written for the people as a way to summarize the goals and scope of the Constitution.
Can the Supreme Court cite the Preamble instead of an amendment as the primary basis for the constitutionality of a law?
The phrase domestic tranquility in the preamble refers to peaceful conditions here in the United States. Conditions at the time that the preamble was written, which was right after the Revolutionary war were tumultuous and leaders of the time realized that the government was ineffective in restoring order.
The theory that best matches the preamble to the U.S. constitution is the will of the people. The preamble refortified the fact that the constitution was written by and for the people. This means the constitution continues to be a living document, since it governs the will of an entire nation. Without a democratic form of government, however, the constitution would simply be null and void.