You can’t look at things that individual people have done, you have to look at the stance of a group as a whole. While both Liberals and Conservatives have things which are wrong, I firmly believe that Liberals have more things wrong, and more severe.
There are 2 main issues that I look at – abortion and gay marriage. R’ Moshe Feinstein wrote straight out that abortion is murder. For those who will ask, “Then why doesn’t a person who purposely causes a miscarriage get the death penalty?”, I refer to you the Meiri. He said that killing an unborn child is such a major sin that even death can’t atone for it, so we don’t give the death penalty. Liberals have made abortion one of their main issues, and they fully support it. In Judaism, the only time abortion is allowed is when the fetus presents a danger to the health of another person (usually the mother, but can also be another fetus in cases of multiple pregnancies.)
Gay marriage is the other issue. I remember learning that according to one opinion, the final straw in the times of Noach that led to the flood was because they began writing marriage contracts between couples of the same gender. So this is what we’ve come to – we are as bad as that generation. This is one of the 7 mitzvos b’nei Noach, and incredibly, there are Jews who claim to be Orthodox who supported allowing it!