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collapse of the mainstream parties
It's a hard one isn't it? TBH I don't have a great knowledge of French politics, just a bit of an interest.
One the one hand, yes, of course you can't deny that the mainstream parties have taken a hit and that less trad. parties have gained.
However, France has always had a more diversified party culture than the UK and US. The right rallied around Le Pen and the Centre Right/conservative and Left still did well. And as you rightly point out Macron is not necessarily the outsider some people make him out to be.
So collapse seems a bit strong*. Disillusioned? Looking for alternatives?
Also at the moment I'm heavily influenced by a discussion I heard on the unsuitability of the UK's parties for its current range/split of opinions and demographics. Interestingly in relation to the US, some pointed out that Trump actually just did as well as you'd expect of a GOP candidate - no better.
*or I may be naive and those fig.s equate to a total disruption of the political landscape.
Curious to know how this compares to previous 1st rounds.
Time to buy €uros I guess.