Yes, but this wasn't the usual two-party election. The 1972 referendum to join the EU got a 67% "yes" vote, the 2011 Alternate Vote referendum got a 68% "no" vo

Yes, but this wasn't the usual two-party election. The 1972 referendum to join the EU got a 67% "yes" vote, the 2011 Alternate Vote referendum got a 68% "no" vote. You see similar number with, say, California's ballot propositions: a "solid win" is closer to a two-thirds majority. 52-48 is close enough to flip depending on the weather.