There is no surer way to turn over the fate of our structure of government to the left's formidable forces of populism and demagoguery. Just think of the groups that would descend on such a convention, along with the pointy-headed professors dedicated to indoctrinating our kids on the "evils" of America: the Service Employees International Union, Rainbow/PUSH, the armies of militant homosexual and feminist activists, environmentalist loons, Soros socialists dressed as free market champions, the Shariah lobby, Code Pink and Greenpeace. This would be their chance to work their revolutionary magic in one fell swoop. You couldn't give them a better gift.
Consider the untold damage the enemies of liberty have visited on our Constitution despite its formidable institutional safeguards against such assaults. Imagine what mischief they would concoct if they were allowed to directly reframe the entire system.
The Constitution, as written, is nothing if not a document designed to maximize liberty and prevent tyranny by limiting the unrestrained powers of government. The disparate leftist groups doubtlessly salivating at the prospect of a new constitutional convention are united in their contempt for the founding concept of limited government and the constitutional scheme of checks and balances designed to ensure it. If you think you've seen community organizing and activist thuggery -- just you wait.
Leftists, from the netroots to the radical activist groups to government officials, have all shown their willingness to twist the Constitution and thwart its provisions to achieve their policy ends. Indeed, those in the ruling class have demonstrated their disrespect for constitutional limitations on their power in their actions and in their shocking statements in which they expressed incredulity that they should be asked to justify their legislation on constitutional grounds. Leftists in the judiciary are just as bad.
If the mobs had their way, health care as a "right" and the suppression of speech dressed up as campaign finance reform would only be the beginning. I shudder to think of the panoply of other ingenious ideas leftists would seek to impose were they to sit down at such an anarchists feast.
The remedy to the generations-long encroachments on the integrity of the Constitution is to throw out the bums who insist on destroying our form of government and replace them with those who respect the concept of limited government and cherish our liberties.