Some are in lock step, and some aren't.
My school's PTA isn't. The district is closing our school, so our PTA officers are active in trying to split our district and create a new one. The local PTA chapter president doesn't support our position, but we don't care.
However, I am going to have to rethink my position of giving to the PTA next year when we go to our new schools.
The meeting I attended was to rally everyone to vote for new school bond measures in the upcoming election. They were taking a pseudo vote amongst those of us attending and it was obvious that if you opposed the measure they would have gotten out the pitchforks. There was no discussion, just a 'let's all drink the kool-aid' rally.