U.S. Secretary of State Hillary Clinton has said she will not serve a full eight years in her position if President Barack Obama is elected to a second term.

In a nationally televised interview with PBS television's Tavis Smiley Wednesday, Clinton she could not imagine serving a full eight years. She told her interviewer that, considering the demands of the job, she would find that extremely challenging.

Clinton - who had been a candidate for president in 2008 - also ruled out a second presidential run.  She had said previously she would also not seek re-election to the New York Senate seat she held until 2009 when she took her current position.  She indicated she would like to return to private life

Clinton had been first lady of the United States while her husband, Bill Clinton served as U.S. President from 1992 to 2000. 

Some information for this report was provided by AFP.