Obama's billion dollar campaign war chest can't get him out of an embassy parking lot

Not much by way of substance here, just the president’s massive limo getting stuck in a security gate.

Mechanics rushed in to rescue the vehicle which was lodged helplessly on the ramp, while onlookers stood and watched – some of whom took video footage and photos.

The car, worth over $1million, is 18ft in length, weighs 8 tons and 8inch thick armour plating on its doors.

Specially built for Obama, the General Motors GM.N vehicle boasts its own oxygen supply in case of chemical attack and puncture resistant, run-flat tyres reinforced with kevlar.

However none of this, it appears, could overcome the might of a lowly speed hump.

The incident will bring Obama’s security into question. His aides have gone to great lengths to ensure the President’s safety while he’s visiting the UK.

Such is the emphasis on security that Mr Obama’s team has even asked to fit bomb-proof double glazing to the windows of his guest suite at Buckingham Palace.