I think the liberal dominance of higher education is already past its peak. It's still going on, and most professors still (consciously or subconsciously) expect their colleagues and even students to be fellow liberals, but enough people are worried about the situation that a critical mass has been reached. There was a fantastic article in the Chronicle of Higher Education a month or two ago about how the liberal bias perpetuates itself and harms even liberals by locking out opposing views and losing touch with reality. And now we're starting to see things like the President of Brown University attacking the lack of intellectual diversity on campus
Students like us (I'm a libertarian) are actually kind of lucky, as I see it. We get to be in the forefront of bringing intellectual diversity to campuses that have marginalized people like us for decades. I'm excited about it.
You should definitely tell those schools about your political experiences. At one or two liberal schools, it might even turn out to be a plus that you're a conservative.