Is your life devoted to attacking the Tea Party patriots?
Of course, the Constitution is meant to constitute the federal government, including specifying its structure, membership, operation, limited powers, interaction with states, and its subordinate relationship to the people (Preamble and Amendments 9 & 10).
The common defense is one important aspect of the Constitution: A defense against both foreign and domestic threats. However, the people can never be a threat since they are the masters of government, and not the other way around.
Regarding "general welfare": The term general welfare is meant as a limitation. It means the opposite of "specific welfare" -- that is, a prohibition on special-interest legislation, or legislation designed to benefit only certain parts of America. That is why, even to this day, the granting of benefits to limited groups is derisively referred to as "welfare". Opponents of welfare schemes ask: "Where in the Constitution is this power granted?" Proponents said: "Ah, 'general welfare'".
It is clear that the Tea Party movement seeks to defend the Constitution, especially against the encroachments of Progressives and the putative ruling class.