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Edit:  Adding another news article that speaks more at length on this:
Clarence Thomas' dangerous conceit
Op-Ed 
The  Supreme Court justice argues that criticism of him is an attack on the  court itself. But a single justice doesn't define the institution.
March 06, 2011|By Jonathan Turley
Louis  XIV of France was infamous for his view that there was no distinction  between himself and the state, allegedly proclaiming "L'État, c'est moi"  ("I am the State"). That notorious merging of personality with an  institution was again on display in a February speech by Supreme Court  Justice Clarence Thomas before the conservative Federalist Society.
  Thomas used the friendly audience to finally address a chorus of  criticism over his alleged conflicts of interest and violation of  federal disclosure rules concerning his wife's income. Rather than  answer these questions, however, Thomas denounced his critics as  "undermining" the court and endangering the country by weakening core  institutions.
 In January, Common Cause released documents showing that Thomas had  attended events funded by conservative billionaires David and Charles  Koch. Thomas was even featured in Koch promotional material — along with  Glenn Beck, Rush Limbaugh and others — for events that sought financial  and political support for conservative political causes.
 Worse  yet, Common Cause discovered that Thomas had failed to disclose a source  of income for 13 years on required federal forms. Thomas stated that  his wife, Virginia, had no income, when in truth she had hundreds of  thousands of dollars of income from conservative organizations,  including roughly $700,000 from the Heritage Foundation between 2003 and  2007. Thomas reported "none" in answering specific questions about  "spousal non-investment income" on annual forms — answers expressly made  "subject to civil and criminal sanctions."
 In the interests of  full disclosure, I was consulted by Common Cause before the release of  the Thomas documents. I found the violations regarding Virginia Thomas'  income particularly alarming.
 Virginia Thomas was receiving money  from groups that had expressed direct interest in the outcome of cases  that came before her husband, including Citizens United vs. Federal  Election Commission, in which the court in 2010 struck down limitations  on corporate contributions to elections.
 A justice is expressly  required by federal law to recuse himself from any case "in which his  impartiality might reasonably be questioned." This law specifically  requires recusal when he knows that "his spouse … has a financial  interest in the subject matter in controversy or in a party to the  proceeding, or any other interest that could be substantially affected  by the outcome of the proceeding."
 The financial disclosure forms  are meant to assist the public in determining conflicts of interest.  Though Thomas clearly could argue that his wife's ties to these  organizations were not grounds for recusal, he denied the court and the  public the ability to fully evaluate those conflicts at the time.  Instead, Thomas misled the public for years on the considerable wealth  he and his wife were accumulating from ideological groups.
 After  Common Cause detailed the violations, Thomas simply wrote a brief letter  to the court saying that the information was "inadvertently omitted due  to a misunderstanding of the filing instructions."
 It is unclear  how Thomas will rule in the next case in which an individual is accused  of a failure to disclose on tax or other government forms. Thomas is  viewed as one of the least sympathetic justices to such defenses.  Indeed, last year, he joined a decision in Jerman vs. Carlisle that  rejected a defense from debt collectors that their violations were due  to misunderstandings of the requirements of federal law and just "bona  fide errors." In rejecting the claim that such errors were not  intentional, the court reminded the defendants that "we have long  recognized the common maxim, familiar to all minds, that ignorance of  the law will not excuse any person, either civilly or criminally."