No. I'm saying that I have the opportunity to vote for who sits on the board. I'm pretty middle ground politically so I vote for the person whose philosophy seems to most closely match my own despite their political affiliation.
I see no evidence that they are particularly liberal. What do you see, specifically, that makes you say that?
When I look at the disappearance of the arts, reliance on abstinence only sex education, relentless standardized testing, and teaching creationsim as a science, I think that many school boards are pretty darn conservative.