When a human becomes a human is a gray area so people can pick different times. I don't really see what liberal or conservative has to do with this. Personalty I choose a later time for the sack of convenience, but other can see it differently if they choose. What I have a difficult time understanding is why anyone who isn't religious would want to choose an earlier date for human-hood states.
I am a liberal prolifer. I am part of a growing movement of prolifers. Democrats For Life is a liberal prolife organization. Saying that no true liberal can be prolife is the no true Scotsman fallacy. I love kittens, puppies, birds, mice, butterflies, lady bugs, and so on. One, two, three, four, five, six, seven.