I've looked at some of the suburb in the 1st district. It contains the posher parts of the suburbs (I Grenoble, unlike most cities, the wealthy live in the NorthEast ; because of the mountains it is where the sun sets latest)

Some of the towns like Meylan or Corenc, socilogical equivalent to the posh suburbs of the Hauts-De-Seine in Paris, used to go 65-35 to the  right wing, yet this time voted 53-47 for the left wing. That's a 20 points turnaround.

The district was really built so that it would be possible to have a right wing deputy in left wing Grenoble, meshing a leftwing quarter of Grenoble with the most right wing parts of the suburbs.

I didn't know about Carignon's ballot stuffing rumors. Wouldn't amaze me.

About irascible Grenoblois, the 2004 cantonale was a fun election : the mairie was starting to build a football stadium in boboland, reducing green areas and teargassing protesters in the meantime. The result was a surprise election of a Green council member, not of a rightwing one...

Un roi sans divertissement est un homme plein de misères