David Cameron congratulates 'my friend Barack Obama' as he wins second term in White House

Mr Cameron tweeted: "Warm congratulations to my friend @BarackObama. Look forward to continuing to work together."
Speaking during a tour of the Middle East, the Prime Minister said: "I would like to congratulate Barack Obama on his re-election. I have really enjoyed working with him over the last few years and I look forward to working with him again over the next four years.
"There are so many things that we need to do: we need to kick start the world economy and I want to see an EU-US trade deal. Right here in Jordan I am hearing appalling stories about what has happened inside Syria so one of the first things I want to talk to Barack about is how we must do more to try and solve this crisis.
"Above all, congratulations to Barack. I've enjoyed working with him, I think he's a very successful US president and I look forward to working with him in the future."
Meanwhile, Mr Obama was also taking to Twitter, telling supporters: "This happened because of you. Thank you". Within minutes, the tweet had become the most popular post in Twitter's history. A similar Facebook update was "liked" more than a million times in the first hour after it was posted.


However there were reports that Repubicans were intending to contest the result in Ohio, even though Mr Obama had appeared to have won a sufficient number of battleground states to ensure victory.
The writing had been on the wall for Mr Romney for the best of an hour after several key states, including New Hampshire, Pennsylvania, Wisconsin and Michigan had been called for the Democrat cause.
Just twenty minutes after the last polls closed in California, Republicans were forced to digest the certain news of their candidate’s defeat, as it became clear that there no routes left to a Republican victory.
"This is a time of great challenges for America and I pray that the president will be successful in guiding our nation," Romney told supporters in Boston as he conceded defeat.
"I so wish, I so wish, that I had been able to fulfill your hopes to lead the country in a different direction, but the nation chose another leader," Mr Romney said in his concession speech.
In Ohio, it appeared as if Mr Obama’s decision to use government money to rescue the American car industry had paid a massive electoral dividend, with exit polls showing six out of ten voters had considered the bailout significant.