US president Barack Obama’s ‘four more years’ celebratory re-election tweet has sent Twitter records tumbling as the most retweeted message of all time.

The tweet was sent by Mr Obama moments before his victory speech in Chicago after he defeated Republican rival Mitt Romney in the race to the White House.

Almost 500,000 people retweeted the message, which features an image of the president embracing his wife Michelle, in a matter of hours.

Election day quickly become the most tweeted event in US political history with over 31million tweets being sent across the day.

As election fever hit the heights, more than 327,000 tweets per minute were being sent as TV networks confirmed Mr Obama’s re-election.

‘One hundred million votes and 31million tweets later, Election Day 2012 has come to a close,’ Twitter said in its blog.

‘As the results of the election were called by news organizations, the conversation on Twitter surged, hitting a peak of 327,452 Tweets per minute (TPM).

‘Before President Obama took the stage to address the nation, he shared a special update on Twitter.

‘As thousands of supporters cheered in Chicago, more than 455,000 (and counting) retweeted his celebratory message.’

Political leaders also took to the micro-blogging sites to congratulate Mr Obama including prime minister David Cameron, Malaysia’s Mohd Najib Tun Razak and Australian prime minister Julia Gillard.

Twitter spokeswoman Rachael Horwitz said: ‘Twitter brought people closer to almost every aspect of the election this year.

‘From breaking news, to sharing the experience of watching the debates, to interacting directly with the candidates, Twitter became a kind of nationwide caucus.’