Socialdemocracy in Poland suicided on similar tactic. They took their voters for granted and kept moving right in order to gain liberal votes. Of course they didn't, and lost their voters in the process, to the point of nearly getting kicked out of parliament itself. The only lesson they learned on this is to become 100% liberal and to openly form a bloc with them.

Succdems gonna succ, the more i look at them (not only in Poland), the more i come to conclusion those people are way too stupid to be even alive, so they aren't stupid, and it's all the perestroika frozen in time.