Russ Feingold of Wisconsin have said no to a bid for the presidency in 2008.
So is the President concerned that ads like this do diminish the office of the presidency?
What may have delivered the presidency to Obama is a fundamental shift in the American public.
Purdum learned this, in part, by reporting a day in the life of the presidency.
Mr Medvedev, who has held the presidency since 2008, is widely expected to become prime minister.
The Gaullists, under Mr Sarkozy and his predecessor, Jacques Chirac, have held the presidency since 1995.
Steve Forbes talked about IT when he ran for the presidency in year 2000.
Constitutional reforms watered down the vast powers that the presidency had enjoyed under apartheid.
It is not certain Obama will win the presidency, though the odds favor him.
But the Tutsis want the presidency and vice presidency to alternate between the two communities.
Hillary Clinton and Barack Obama undoubtedly think they can win the presidency without small-business support.
Tax cuts passed during the presidency of George W Bush formally expired at midnight (05:00 GMT).
Each has promised to give key posts to the two others should he win the presidency.
Lugo was made a lay Catholic in 2008, about the time he assumed the presidency.
This energetic style was carried over into his campaigning for the presidency in 2012.
The power of the Presidency is often thought to reside within this Oval Office.
"Speak to the American people passionately and gracefully about Obama taking the presidency, " Davis said.
CNN: Bush's legacy evokes passionate, sometimes angry reader response
That's a bigger increase than when the Democrats last held both Congress and the presidency.
An added bonus would be helping Al Gore to succeed him in the presidency.
"Mr. President, your conduct is a national embarrassment and the presidency is not yours to trash!"
Mr Fonseka was arrested two years ago after standing against Mr Rajapakse for the presidency.
Mr. President, your life story -- from crushing poverty to the presidency -- is an inspiration.
The facility drew sharp criticism, including from Barack Obama as he campaigned for the presidency.
So it is unlikely that they will challenge each other for the presidency in 2012.
After considerable deliberation and reflection, I have decided not to pursue the office of the presidency.
So it will be interesting to see what the presidency of Barack Obama does concerning it.
But no sooner did Barack Obama ascend to the Presidency, then the country split asunder.
Democrats won the Presidency with a history-making candidate and had sizeable majorities in Congress.
Nixon would have reached the Presidency a dozen years sooner, at the age of forty-four.
Many do not now expect him to recontest the presidency in next March's elections.
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