We must not give into blackmail from a few statesman overseas. Many of these political figures may be unemployed after the U.S. elections next year. We Brits must think for ourselves about the long term prospects of being in or out of the E.U.
We need to know if the E.U. can become more democratically accountable to all E.U. nations and stop steam rollering threw policies without proper consent. The E.U. is in a big mess at the moment, but long term... ?
As for some American politicals or other nation's; its not their choice to make. Blackmail just makes people more vexed and likely to go against such silly dogma. So please keep out of it. The pro - European camp has enough to do without such stupid and negative threats.