Usually, citizen groups ask politicians to take pledges to do or not do something once elected.
Two different organizations taking a slightly different tact, asking voters to take a peldge, and COAST supports them both:
1) www.WeDemandABalancedBudget.Com has asked for voters to pledge not to contribute to or vote for any candidate for the US House or Senate unless they agree to pass the People's Balanced Budget Amendment. COAST heartily supports this and asks that you take the pledge.
2) www.alliance4selfgovernance.org asks that voters take a pledge to vote in Congressional primary elections. This group correctly points out that the vast majority of Congressional districts in the nation are so tilted in favor of one political party or another that challengers in general elections have little chance of prevailing. As a result, politicians are insulated from their constituents and become beholden to special interest grouns in Washington. Take their pledge here.