… “There’s almost no such thing as ‘don’t know’ when it comes to Obama,” said Douglas Rivers, a Stanford political science professor who also runs the YouGov polling firm. …
So when Republican groups spend millions on advertising calling Obama a failure, they’re pushing against a relatively immovable object — voters who mostly decided what they think of the president long ago.
When it comes to Romney, though, it’s another story. [cont.]
Doyle McManus, Los Angeles Times