Why do you think President Obama attacks Rush Limbaugh and Sarah Palin?

President Bush and Vice President Cheney aren't around anymore.
Obama doesn't like them or their politics.
Limbaugh and Palin are his chief rivals or the best known conservative spokespersons.
The base likes it.
It's Obama's way of showing how much smarter and more tolerant he is.
Other or I don't care.
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