I'm not sure that it doesn't get the libs some traction with the undecided voters. The moderates and undecided are often very prone to go with how people will view them. They don't want to be associated with someone who is painted as "stupid" because they like to think they are above it all - ergo, intellectual.
Analysis?
Agreed. The left tries to do it.. and if people believe it.. they ARE stupid lol.