Elections supposedly prevent convulsions, serving as safety valves that vent social pressures and enable course corrections. November's election will either be a prelude to a convulsion or the beginning of a turn away from one.

America's public-policy dysfunction exists not because democracy isn't working but because it is. Both parties are market mechanisms, measuring more than shaping voters' preferences. The electoral system is a seismograph recording every tremor of public appetite. Today, the differences that divide the public are exceeded by the contradictions within the public's mind.

America's bold premise is the possibility of dignified self-government -- people making reasonable choices about restrained appetites. But three decades ago, Harvard political scientist Samuel Huntington postulated that America suffers recurring political convulsions because the gap between the premise and reality becomes too wide to ignore.

Now Michael Greve, a constitutional scholar at the American Enterprise Institute, argues: "We like to tell ourselves that all our constitutional stories must have a happy ending." The Founders' foremost problem, Greve says, was debt. To establish the nation's credibility, they needed to replace the Articles of Confederation with the Constitution. "We," Greve says, "merely have to return to it, if we can." He wonders whether we can.

The national debt of $16 trillion (growing $4 billion a day), plus what the government owes its various trust funds, is more than 100 percent of GDP. Ninety percent is where economic anemia seems to deepen. States' debts are about $3 trillion and their unfunded pension liabilities probably are another $4 trillion. "Debts of this magnitude," Greve says, "will not be paid."

Barack Obama's risible solution is to add 4.6 points to the tax rate for less than 3 percent of Americans. Some conservatives have the audacity of hope -- expecting 5 percent economic growth (the post-1945 average: 2.9 percent) and planning to continue financing the debt by borrowing at negative interest rates. Of our long slide into financial decrepitude, Greve says: "The rate of deterioration does not correlate in any obvious way with political control over the presidency and Congress."

The housing debacle was not the result of "a spontaneous outbreak of private irresponsibility." Public institutions and policies provided occasions and incentives for the exercise of private vices. Washington pays up to 80 percent of state Medicaid expenses, so states' citizens demand more Medicaid services. Although the elderly consider Social Security and Medicare earned, Greve says: "Most retirees could not have earned their expected payment streams if they had worked two or three jobs."

"Our politics," says Greve, "aims at inspiration on the cheap." We should reduce government's complicity in illusions by, for example, sending retirees "a statement showing the estimated present value of their old-age benefits; their lifetime earnings and contributions; and the earnings and contributions that it would have taken to 'earn' those benefits. We might then ask them who precisely should earn and remit the missing millions and in what sense it would be 'unfair' to modify the empty promises."

Rash promises were made, Greve says, "in an era of prosperity." Now they "are far too entrenched to be dislodged in the course of ordinary politics." Even granting Mitt Romney's embrace of something like his running mate's reforms, this year's politics are terribly ordinary. Although consensus is supposedly elusive, it actually is the problem.

George Will is a syndicated columnist.