How do you define "politically effective"? There are many ways to be politically effective, Bob, but they all boil down to two:
1. Mobilize your base; and
2. Convince the undecided (and by that, I include less-than-fully-committed opponents).
Participating in such an event, or at least seeing it on Fox (and that's what the base is watching) will mobilize the base. And we can see what we can do about getting it on the mainstream evening news broadcasts like NBC and CNN, which would start to convince the undecided. They claim to be balanced. In order to maintain that facade, they may be vulnerable to getting shamed into it.
Much of the opposition to the war is based on factors that have nothing to do with how the war is going. And about half of the people who now say they oppose the war have previously supported it. They can be convinced to do so again.
Remember right after 9/11, when Bush's job approval rating was 90% or so? There was still a 7% moonbat sliver that said they disapproved of the job that Bush was doing. We will never reach them.
But the other 93% are either already ours, or within reach.
"How do you define "politically effective"?"
Easy. The numbers of eyes and ears that are exposed to your message.