French voters (even older ones) typically give little or no importance to questions of marital/sexual mores when choosing candidates.

linca's 1968 explanation is spot on imo - this is a matter, for these pre-baby-boomers, of considering the country has gone down the drain, authority and discipline need to come back, etc. Jérôme points out the irony of people who no longer work supporting the candidate who says he's for the "work value", but in fact it's quite "logical": they feel they worked hard during their lifetimes and now no one works any more.

So I'd say it's law, order, authority, discipline, work. In fact a line-up that will get out the silver-haired vote in pretty much any country, and certainly in France.