In postwar France the PCF had a large swathe of support after the war due to the Communist role in the resistance (among other reasons). At this time the PCF wa

In postwar France the PCF had a large swathe of support after the war due to the Communist role in the resistance (among other reasons). At this time the PCF was a very pro-Soviet party and this support for the Soviets may have translated into the result that you see in the referenced poll. Support for the PCF waned after de-Stalinization, the Hungarian Uprising and finally the Prague Spring; I'd wager that if one were to look at levels of support for the PCF over the years one could map the switch in perception as to which country contributed most to winning the war.