2018 Haute-Garonne's 8th constituency by-election|
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| Turnout | 34.41% 18.35% (first round) 33.08% 14.13% (second round) |
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| Nominee |
Joël Aviragnet |
Michel Montsarrat |
Philippe Gimenez |
| Party |
PS |
LREM |
LFI |
1st round % |
10,777 38.74% 20.96% |
5,651 20.31% 13.09% |
3,623 13.02% 1.08% |
2nd round % |
17,156 70.30% 20.17% |
7,247 29.70% 20.17% |
Eliminated |
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| Nominee |
Marie-Christine Parolin |
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| Party |
FN |
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1st round % |
3,264 11.73% 3.50% |
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2nd round % |
Eliminated |
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A by-election was held in Haute-Garonne's 8th constituency on 11 March 2018, with a second round on 18 March as no candidate secured a majority of votes in the first round. The by-election was prompted after the Constitutional Council invalidated the election of Joël Aviragnet, candidate of the Socialist Party (PS), in the June 2017 legislative elections on 18 December 2017.
Aviragnet was re-elected by a massive margin in the second round rematch against Montsarrat, securing over 70% of valid votes and winning by a margin 40 points larger than in June 2017.