Certainly I would not have expected an ethics violation by Lindsey Graham, but would it not appear that Alito participated knowingly in this violation? From The Village Voice with cites to the WSJ and Think Progress:
""On Thursday, Sen. Lindsey Graham of South Carolina, one of the 'gang of 14' who sits on Judiciary, joined a so-called moot court session at the White House.''
The coaching session for Alito has raised a few eyebrows.
"Coaching a judicial nominee behind-the-scenes is not the proper role for a Judiciary Committee member who must subsequently sit in judgment on that nominee," writes Think Progress, a project of the American Progress Action Fund. "It could be a violation of the ethical duties of a senator."
Writing about the Alito situation, Think Progress cites Senate Rule 37 in the Senate Ethics Manual. The rule says: "No Member, officer, or employee shall engage in any outside business or professional activity or employment for compensation which is inconsistent or in conflict with the conscientious performance of official duties."
Think Progress further cites the ethics manual, saying that language has been interpreted as prohibiting "compensated employment or uncompensated positions on boards, commissions, or advisory councils where such service could create a conflict with an individual's Senate duties due to appropriation, oversight, authorization, or legislative jurisdiction as a result of Senate duties.""