Ummm, No, fans buy a ticket to be entertained by her. That includes, singing, dancing and what ever other schpielkis she decides to throw into her show. Even if it's some political comedy.
I was just at a Roger Waters concert and he had "IMPEACH BUSH" plastered all over his flying "Animals" pig. Didn't hear anyone complain about that and he's not even American.
And bands like U2 have made careers out of "entertaining" people with a political message.
What about Green Day's "American Idiot" or Billy Joel's "We didn't start the fire" or John Lennon's entire hit list.

So it's not fair for us to say, it's okay for her but not for him or vice versa. Entertainment usually carries some sort of message be it political or other. Otherwise we would not have great songs like "Biko" by Peter Gabriel or "We are the World" by everybody..

Just my .02

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"When two people agree on everything, one of them is not necessary" - Arliss