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Supporters of Democrat US presidential contender Bernie Sanders will hold a rally outside the Houses of Parliament tomorrow.

The event coincides with Super Tuesday, when Democrats and Republicans in 13 states nominate who should run for the White House.

The 2016 primary season has been set alight by Mr Sanders and Republican Donald Trump emerging as potential winners of their respective contests.

With the outcome for both parties expected to be tight, voters outside the US could play a key role.

Travis Mooney, co-coordinator of LondonforBernie.org, behind the rally, said: “In 2008 1,400 Democrats voted in London but this time we have nearly 1,000 Bernie supporters alone.”

The London for Bernie Rally will start at Parliament Square at 6pm and proceed to the US Global Presidential Primary voting centre in Great Smith Street. Vermont senator Mr Sanders shocked Hillary Clinton’s campaign with the level of support for him in early battles. However, the ex-Secretary of State won a resounding victory this weekend in South Carolina.

Sanders’ London suppor-ters will join Democrats at other UK voting stations to have their say by post, fax, and email until ballots close on March 8. Elsewhere in the capital, Republican Party members will gather for Super Tuesday events, although details are unconfirmed. Last week, Mr Trump cemented his position as Republican frontrunner in the Nevada caucuses.