"Common Market is one thing, big political state is something else."
Its interesting that this erroneous point is still brought out.
The political aspects of the EEC were known in 1975, its on the leaflets from that referendum.
Furthermore, Cameron got an agreement for exemption from ever closer union ( although he didn't actually need to) which indicates that we would never have been part of a big political state in the extremely unlikely event of it happening.
Poor justification.