Rising frustration with Washington and conservative electoral victories across much of the U.S. are feeding a movement in favor of something America hasn't done in 227 years: Hold a convention to rewrite the Constitution.

Although it's still not likely to be successful, the effort is more serious than before: Already, more than two dozen states have called for a convention. There are two ways to change or amend the founding document. The usual method is for an adjustment to win approval from two-thirds of the Congress and then be ratified by three-quarters of the states. There have been 27 amendments adopted this way.

The second procedure is separate from Congress. It requires two-thirds of the states, or 34, to call for a convention. The framers thought this was necessary because Congress wouldn't be likely to advance any amendments that curtailed its powers. But this recourse never has been used.

Two states, California and Vermont, have called for a convention to overturn the Supreme Court's Citizens United decision that permits huge amounts of unregulated money into federal campaigns. Larry Sabato, a University of Virginia political scientist, wants a convention to adopt sweeping changes, including a single six-year presidential term and concomitant House and Senate terms, to create more of a parliamentary system. Petitions to adopt term limits for members of Congress have circulated for years.

But much of the current impetus comes from fervent fiscal conservatives. This includes calls for an amendment requiring a balanced budget and other restraints on the federal government's spending and taxation powers.

A constitutional convention is a rallying cry for right- wing talk-radio hosts such as Rush Limbaugh and Mark Levin; the idea has been endorsed by Senators Ron Johnson of Wisconsin and Oklahoma's Tom Coburn, both conservative Republicans. An influential backer is the American Legislative Exchange Council, known as ALEC, an organization of conservative state legislators and private sector lobbyists that advocates for corporate interests.

However, many constitutional scholars believe that limits cannot be placed on a convention; if one were convened, anything could be up for consideration. A convention "can propose what they think is appropriate," says Michael Paulsen, a professor at the University of St. Thomas law school in Minneapolis who is an expert on the issue. "There is no good theory under which the convention can be 'limited' to specific topics - far less to a specific proposed 'text.' "

Accordingly, say experts such as Walter Dellinger, a former U.S. solicitor general and a constitutional scholar, no limits can be imposed on calls for a convention. That's why he believes the current petitions from states, even if they reach the two-thirds mark, are invalid.

"Thirty-four times zero is still zero," he says.

If, however, the backlash against Washington intensifies, the Republican-led Congress stalls, these imperfections are corrected and a convention were held, Congress would play a relatively minor role. It might decide how the size of different delegations should be determined. After the federal lawmakers "specify the time and place for kicking it off," Paulsen says, "they then have to get out of the way."

Although it's chiefly the political right driving this proposal, there are more than a few staunch conservatives who say it's a bad idea. Foremost is U.S. Supreme Court Justice Antonin Scalia, the longtime leader of the court's conservative bloc, who observed this summer: "Whoa! Who knows what would come out it?"

Some proponents argue that a check on any convention deliberations would be that three-quarters of the states then have to ratify any decisions, so radical stuff such as changing the First Amendment wouldn't fly. "That is a huge hurdle," Paulsen says.

Yet other observers such as Dellinger worry about the possibility of a run-away process that could rattle both the left and right. They doubt that modern-day James Madisons or Alexander Hamiltons would be in attendance to temper the proceedings.