Because the fact of the matter is, the American people already agree with me. There are polls showing right now that the American people for the most part think it's a bad idea to provide tax cuts to the wealthy. ~ Pres. Obama during his press conference 12/7/2010This Bloomberg poll is the kind thing Obama was refering to, where 60% of Americans polled oppose granting tax cuts to the rich.
To Congressional Democrats Pres. Obama is saying something complete different. To them he is using another (Gallup) poll that doesn't use the word "wealthy" to push the argument that the public supports tax cuts for the rich.
The President isn't quite lying. But he is speaking with a forked tongue.