Former US Republican presidential nominee Mitt Romney will not run for president in 2016.
Romney's announcement comes just three weeks after he unexpectedly revealed he was considering a third shot at the White House. The former Massachusetts governor had told a small group of former donors in New York he was thinking about running again.
However, he then discovered that a number of his previous supporters had jumped ship to former Florida governor Jeb Bush.
Romney's exit from the campaign benefits the other favourites of the party's establishment wing including Bush, New Jersey Gov Chris Christie, Florida Sen Marco Rubio and Wisconsin Gov Scott Walker.
President Barack Obama is still holding a narrow advantage over presumptive Republican nominee Mitt Romney in three of the most pivotal presidential battleground states - Florida, Ohio and Virginia, according to new NBC-Marist polls.[
](http://firstread.msnbc.msn.com/news/2012/05/24/11854807-nbc-polls-obama-edges-romney-in-three-key-battleground-states?lite)More on this from MSNBC
Mitt Romney breezed to an easy victory in the Washington state Republican presidential caucuses, earning another momentum boost heading into next week's crucial "Super Tuesday" contests in 10 states.
With about 80 percent of precincts now in, Romney had 36 percent support.
The outcome marked a fourth state win for Romney this week, after the former Massachusetts governor picked up contests in Michigan, Arizona and Wyoming. He also won the other most recent vote, the Maine caucus on February 11.
After thanking Republican voters in Michigan, Mitt Romney used his victory speech to attack Barack Obama, saying the president has put the country "on a path towards debt and deficit."
Rick Santorum has already conceded both states to Mitt Romney, but officially not all votes have been counted.
Here are the latest figures from CNN:
In Michigan, where 92% of votes are reported;
- Romney: 395,470 (41%)
- Santorum: 366,358 (38%)
And in Arizona, where 83% of votes are reported;
- Romney: 211,747 (47%)
- Santorum: 118,023 (26%)
BREAKING NEWS: Mitt Romney wins Michigan Republican presidential primary
Fox News, NBC News and CNN have all declared Mitt Romney the projected winner in Michigan.
Chuck Todd is a political reporter for NBC news:
NBC News is projecting Romney will win MI.
With 70% of the votes counted, this is how the Michigan Republican primary stands, according to CNN:
Romney: 279,198 (40%)
Santorum: 251,122 (36%)
Evan McMorris-Santoro is a US reporter within the Santorum camp tonight:
According to CNN, this is how the Michigan Republican primary stands at 6% reporting:
Romney: 15,942 (39%)