Only really followed the debate from afar, but it didn't seem a good sign for the approve side that (from what I understand, willing to be corrected) the left wing governing parties had to rush out a set of proposals saying where they'd clarify and amend the constitution in a bunch of places if it passed.
What kind of country would have to go around promising
a bunch of future changes to get a constitution ratified, that's ridiculous!
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For the record I haven't followed any of this and have no meaningful sense of how I would have voted in the referendum.