Four Republican senators have introduced a constitutional amendment to limit senators to no more than two six-year terms in office, and representatives no more than three two-year terms. To become law, the amendment must be approved by two-thirds majorities of both the Senate and House, and by three-fourths of the states.

Senators Jim DeMint, South Carolina, Tom Coburn, Oklahoma, Kay Bailey Hutchinson, Texas, and Sam Brownback, Kansas, are the co-sponsors.

The 22nd amendment to the U.S. Constitution limits presidents to no more than two terms in office. Fifteen states have term limits for various officials, as do many local governments across the country.

DeMint said the amendment is needed because the power of incumbency has grown so great:

"Americans know real change in Washington will never happen until we end the era of permanent politicians. As long as members have the chance to spend their lives in Washington, their interests will always skew toward spending taxpayer dollars to buyoff special interests, covering over corruption in the bureaucracy, fundraising, relationship building among lobbyists, and trading favors for pork – in short, amassing their own power," DeMint said.