This is partly because marginals are the target of most pre-election effort: party bigwigs visit, activists campaign door-to-door, posters are pasted all over town.
Instead of being ushered in to see the president through the front door of the White House, the Russian leader merely saw Mr Bush senior during a stop-by visit at the National Security Council.
During a visit to a hospital in Romford, north London, later in the day, Mr Lansley said his door was "always open" to groups like the BMA and the RCN who were not invited to the earlier meeting.