Michele Bachmann has quit the Republican presidential campaign, saying she "decided to stand aside" in the wake of her sixth place finish in the Iowa caucuses.
Mrs Bachmann said she had "no regrets" whatsoever and said she ran her race with integrity and will continue to fight for the causes she emphasised on the campaign trail.
She referred repeatedly to "Obamacare" and said the Republican Party must not miss a "once-in-a-lifetime opportunity" to repeal both the sweeping health care law brought in by Mr Obama and the financial regulation law known as Dodd-Frank.
It has been a long, deep slide for the Minnesota congresswoman, who enjoyed a high point in her campaign when she won a Republican straw poll in Ames, Iowa several months ago.
Meanwhile Texas governor Rick Perry's campaign told staff he will decide in the next day or two whether to stay in the race.
His national political director delivered the message on a conference call, the day after Mr Perry came fifth in the Iowa caucuses
Earlier advisers said Mr Perry would look closely at the Iowa results, review the organisational and financial resources, and assess the political landscape.Earlier advisers said Mr Perry would look closely at the Iowa results, review the organisational and financial resources, and assess the political landscape.
But after a dismal showing, pressure was building for him to drop out