This is a "No" talking point that is - surprise ... False:

History of the Treaty establishing a Constitution for Europe

Spanish voters were the first to go to the polls in a referendum on ratification on 20 February 2005. Both the government and the main opposition party campaigned for a 'yes' vote. The Constitution was passed by a large margin, with 77 per cent of voters in favour, but major opposition parties declared that the 42 per cent turnout was an embarrassment for the governing Spanish Socialist Workers' Party.

In the wake of the French and Dutch rejections, Luxembourg pressed ahead with its scheduled consultative referendum 10 July 2005. Prime Minister Jean-Claude Juncker stated that he would resign in the event of a rejection. The result was 56% in favour with a high turnout of 88%.

We should not be helping to spread it.