Sen. Jim DeMint (R-S.C.) said the vote on whether or not to ban earmarks will be the first test as to whether members fully grasp the lessons of the midterm elections.
The Republican Conference is scheduled to vote on the ban at their weekly meeting Tuesday.
The debate over the proposed ban, led by DeMint and Sen. Tom CoburnTom CoburnWill Trump back women’s museum? Don't roll back ban on earmarks Ryan calls out GOP in anti-poverty fight MORE (R-Okla.) has already exposed fissures among Republicans in the Senate.
DeMint hinted Monday that Republicans who aren't supportive of the ban could face trouble if they have to face voters in two years, but said he's confident the ban will win approval on Tuesday, led by the newly-elected crop of GOP Senators.
"2012 is going to make what just happened look small if we continue what we started," DeMint predicted.
Voters listed a reduction in spending as one of their top concerns this election cycle; several Republican candidates ran successful campaigns based on that issue.
DeMint entered the gathering Monday, sponsored by the conservative group Americans for Prosperity, to shouts of "DeMint for president," eliciting a broad smile from the South Carolina Republican.
Through his Senate Conservatives Fund, DeMint helped raised several million dollars for Tea Party backed candidates in 2010 and played a leading role in several high-profile GOP primary fights.
On the House side, presumed Speaker John BoehnerJohn BoehnerLobbying World 'Ready for Michelle' PACs urge 2020 run News Flash: Trump was never going to lock Clinton up MORE (R-Ohio) and likely Majority Whip Eric CantorEric CantorChamber of Commerce overhauls lobbying operation Laura Ingraham under consideration for White House press secretary VA Dems jockey for Kaine's seat MORE (R-Va.) announced they will hold a vote among House Republicans to ban earmarks, one of the proposals outlined in their "Pledge with America" released earlier this year.