He "may assign this task to the individual justice best able to hold together a fragile coalition, to an ideologically amenable colleague, or to himself." Opinion authors can have a big influence on the content of an opinion; two justices in the same majority, given the opportunity, might write very different majority opinions. A chief justice who knows well the associate justices can therefore do much—by the simple act of selecting the justice who writes the opinion of the court—to affect the general character or tone of an opinion, which in turn can affect the interpretation of that opinion in cases before lower courts in the years to come. Additionally, the chief justice chairs the conferences where cases are discussed and tentatively voted on by the justices. He normally speaks first and so has influence in framing the discussion. Although the chief justice votes first—the Court votes in order of seniority—he may strategically pass in order to ensure membership in the majority if desired. It is reported that: The chief justice commonly administers the oath of office of the president of the United States. This is a tradition, rather than a constitutional responsibility of the chief justice; the Constitution does not require that the oath be administered by anyone in particular, simply that it be taken by the president. Law empowers any federal or state judge, as well as notaries public (such as John Calvin Coolidge, Sr.), to administer oaths and affirmations. If the chief justice is ill or incapacitated, the oath is usually administered by the next senior member of the Supreme Court. Seven times, someone other than the chief justice of the United States administered the oath of office to the president. Robert Livingston, as Chancellor of the State of New York (the state's highest ranking judicial office), administered the oath of office to George Washington at his first inauguration; there was no chief justice of the United States, nor any other federal judge prior to their appointments by President Washington in the months following his inauguration. William Cushing, an associate justice of the Supreme Court, administered Washington's second oath of office in 1793. Calvin Coolidge's father, a notary public, administered the oath to his son after the death of Warren Harding. This, however, was contested upon Coolidge's return to Washington and his oath was re-administered by Judge Adolph A. Hoehling, Jr. of the U.S. District Court for the District of Columbia. John Tyler and Millard Fillmore were both sworn in on the death of their predecessors by Chief Justice William Cranch of the Circuit Court of the District of Columbia.