1) Liberalism creates a feedback loop. It is usually impossible for a non-liberal to change a liberal’s mind about political issues because liberalism works like so: only liberals are credible sources of information. How do you know someone’s liberal? He espouses liberal doctrine. So, no matter how plausible what you say may be, it will be ignored if you’re not a liberal and if you are a liberal, of course, you probably agree with liberal views. This sort of close-mindedness makes liberals nearly impervious to any information that might undermine their beliefs.
5) Liberals tend to view people as parts of groups, not individuals. One of the prejudices of liberalism is that they see everyone as part of a group, not as an individual. This can lead to rather bizarre disparities when say, a man from a group that they consider to be powerless, impoverished victims becomes the leader of the free world — and he’s challenged by a group of lower middle class white people who’ve banded together because individually they’re powerless. If you listen to the liberal rhetoric, you might think Barack Obama was a black Republican being surrounded by a KKK lynching party 100 years ago — as opposed to the single most powerful man in America abusing the authority of his office to attack ordinary Tea Partiers who have the audacity to speak the truth to power for the good of their country.