That's why they are not going to Ronstadt, they're going to the people who book her into their venues. If they believe booking her will cause a PR nightmare and reduced ticket sales, they might reconsider.
F/911 opened in the US on June 23, 2004. To date it's earned $80,090,000 worldwide.
By contrast, The Passion of the Christ, released Feb 25/04 has earned $609,432,506 . OK, so it had a few months head start. Harry Potter and the Prisoner of Azkhaban was released on June 04, 2004. IT has earned $601,950,000 to date.
The point is that despite the hype, very few people are paying to see Moore's tinfoil hat conspiracy theory movie...and THAT is the same proportion of people who'll go see his new, #1 fan sing.
It's not just what we call conservatives that are tired of the daily hate speeches and wacked out conspiracy theories. It's everyone except for the total wingnuts that already know who they're voting for...IF they vote at all.