Lol, I think she is being a lot more influential than you give her credit for.
I've noticed that people who believe that are those already fans of
her message, & so are willing to overlook her gaffes & awkwardness.
But is it influence when the choir likes the preacher?
Nah, they're already on the same side. And the choir doesn't appear
to be more motivated, nor are they doing anything differently.
(Note that even OAC is scorned for a not so green lifestyle.)
Real influence is when you sway the disaffected & the opposition.
How to do that?
Let's say you're addressing AGW skeptics, & even GW skeptics.
If you want to sell them on a set of policies, propose things which
mitigate GW, but have other strong benefits, eg, cleaner air & water,
energy security, national security, cheaper & better transportation,
cheaper & more convenient housing.
And if one is to sell a message of urgency, then one must also walk
the walk, eg, don't eat meat if you decry it, don't waste gas. It's basic PR.