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** FILE ** Jim DeMint resigned from his U.S. Senate seat representing South Carolina to take leadership at the Heritage Foundation, a conservative Washington-based think tank. (Associated Press)

** FILE ** In this June 17, 2011 photo, Sen. Jim DeMint, South Carolina Republican, speaks in New Orleans. DeMint announced Dec. 6, 2012, that he is resigning to take over at Heritage Foundation. (AP Photo/Patrick Semansky)

Congressional Budget Office (Alternate Fiscal Scenario) via Heritage Foundation

** FILE ** In this June 17, 2011 photo, Sen. Jim DeMint, South Carolina Republican, speaks in New Orleans. DeMint announced Dec. 6, 2012, that he is resigning to take over at Heritage Foundation. (AP Photo/Patrick Semansky)

** FILE ** In this June 17, 2011 photo, Sen. Jim DeMint, South Carolina Republican, speaks in New Orleans. DeMint announced Dec. 6, 2012, that he is resigning to take over at Heritage Foundation. (AP Photo/Patrick Semansky)

Sen. Jim DeMint, South Carolina Republican, is leaving the Senate to head the conservative Heritage Foundation. Gov. Nikki R. Haley will name his replacement. (Associated Press)

Sen. Jim DeMint, South Carolina Republican, is leaving the Senate to head the conservative Heritage Foundation. Gov. Nikki R. Haley will name his replacement. (Associated Press)