Do political parties’ shifts on sociocultural issues, which signify the withdrawal of ideological commitment and disturb their supporters, cause vote loss? We argue that the negative electoral impact of positional shifts is constrained by party supporters’ opinion as well as parties’ ideological strength on sociocultural issues. Using data on party positions and ideologies in Western Europe from 1990 to 2008, we find that only parties holding strong ideologies on sociocultural issues lose votes by shifting their positions on these issues. Even these parties, however, do not lose votes when their position shifts in the same direction as that of their supporters. The results indicate that niche parties are straightforwardly affected by position shifts regarding sociocultural issues; they should adopt different strategies between values they endorse and those they reject; and political parties should not be worried about vote loss from position shifts as long as they follow their supporters’ opinions.