I don't know but the hard bit is getting one of them to push the red button ! 
How many Labour canvassers can you fit in a lift? This is our effort in Leeds Dock just now!
#VoteLabourpic.twitter.com/C3vC3cR2Or
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If the benefits office is on the top floor you'll get more than that in there I'm sure.
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Is the lift going down ? If so, all of them ! Ha.
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