2018 Val-d'Oise's 1st constituency by-election|
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| Turnout | 20.33% 27.76% (first round)
19.09% 20.51% (second round) |
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| Nominee |
Antoine Savignat |
Isabelle Muller-Quoy |
Leïla Saïb |
| Party |
LR |
LREM |
LFI |
1st round
% |
3,855
23.67% 5.92% |
4,768
29.28% 6.65% |
1,867
11.47% 1.34% |
2nd round
% |
7,167
51.45% 5.69% |
6,762
48.55% 5.69% |
Eliminated |
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| Nominee |
Stéphane Capdet |
Sandra Nguyen-Derosier |
Bénédicte Ariès |
| Party |
FN |
PS |
EELV |
1st round
% |
1,647
10.11% 5.19% |
1,121
6.88% 1.40% |
1,009
6.20% 2.33% |
2nd round
% |
Eliminated |
Eliminated |
Eliminated |
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The first round of a by-election was held in Val-d'Oise's 1st constituency on 28 January 2018, with a second round on 4 February because no candidate secured a majority of votes in the first round. The by-election was called due to the invalidation of the election of Isabelle Muller-Quoy, candidate of La République En Marche! (REM), in the June 2017 legislative elections by the Constitutional Council on 16 November 2017. It was the first legislative by-election held during the 15th National Assembly.
In the first round on 28 January, Isabelle Muller-Quoy of La République En Marche! and Antoine Savignat of The Republicans (LR) advanced to the second round, as they did in June 2017, with Muller-Quoy securing a considerably lower share of the vote amid low turnout. Savignat was elected in the second round with 51.45% of the vote, defeating Muller-Quoy.
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