Sen. Jim DeMint (R-S.C.) tweeted twice on Friday to note two more supporters of his earmark ban: Sens. Mike Johanns (R-Neb.) and John Barrasso (R-Wyo.).

The other 13 co-sponsors are: Sens. Tom Coburn (R-Okla.), Bob Corker (R-Tenn.), John Ensign (R-Nev.), Mike Enzi (R-Wyo.), John Cornyn (R-Texas), Richard Burr (R-N.C.) and Jeff Sessions (R-Ala.) and Sens.-elect Pat Toomey (R-Pa.), Marco Rubio (R-Fla.), Rand Paul (R-Ky.), Mike Lee (R-Utah), Ron Johnson (R-Wis.) and Kelly Ayotte (R-N.H.).

DeMint will present the ban to a meeting of the Republican Conference next week, where it will face opposition from a large portion of the caucus.

The language of the proposed moratorium reads, "Resolved, that it is the policy of the Republican Conference that no Member shall request a congressionally directed spending item, limited tax benefit, or limited tariff benefit, as such terms are used in Rule XLIV of the Standing Rules of the Senate for the 112th Congress."