For a Republican in Congress, signing the pledge not to increase taxes is all but required; pledge signers include all but 21 GOP members of Congress. The hottest pledge list, however, is the one to swear off earmarks. Since Rep. Jeff FlakeJeff FlakeFCC's GOP chairman blocks Internet privacy rule Greens launch ads against two GOP senators for Pruitt votes GOP groups ramp up pressure on lawmakers over ObamaCare MORE (R-Ariz.) signed the earmark pledge last summer, 36 others have joined him, including Rep. Judy Biggert (R-Ill.), who signed on Wednesday.

Biggert, in a press release, said that while she supports a moratorium on earmarks for all of Congress,