Among the current body of U.S. Senators, Elizabeth Warren (D-Mass.) is certainly the intellectual favorite of many liberals in the country, and she is already being spoken of as a potential Democratic presidential candidate in 2020. The former Harvard law school professor and consumer protection advocate has a great command of the issues, but her ideological commitments undermine her abilities, making her less effective as a legislator, and an often insufficiently decorous member of the U.S. Senate. Now that she has become a cause célèbre in the matter of Senator Jeff Sessions’ nomination to be Attorney General, the rebukes she is receiving from Republicans will come back to haunt them.