Cherie Blair has firmly ruled out launching a career in politics after her husband Tony leaves Downing Street.
Mrs Blair has tried to keep her political views to herself
Mrs Blair made her vow in an interview with American television in her role as an ambassador for the 2012 Olympics.
Asked if she had political ambitions of her own, Mrs Blair replied: "No, because I have been there."
Mrs Blair unsuccessfully contested the 1983 general election as a Labour candidate in Thanet before quitting politics to focus on law.
She has pursued a successful career as a human rights lawyer and part-time judge and has tried to keep her own political views out of the spotlight.
But speculation she might enter politics after Mr Blair steps down as prime minister before the next election was fuelled when former US President Bill Clinton said that he would support her if she ran for power.
Mr Clinton's wife, Hillary, kept up the family interest in politics after he bowed out of the White House, becoming New York senator and a leading contender for the Democratic nomination for the 2008 Presidential election.
But in an interview with NBC Today programme anchor Katie Couric, Mrs Blair said: "I don't want to duplicate something my husband's done. I've got plenty of things I want to do in my own right."
An extract from Mrs Blair's interview was broadcast by BBC2's Newsnight, even though NBC told the programme it had been recorded on the condition that it was not shown in the UK.