There's actually a huge psychlogical study out there that concluded that basic personality traits that we're largely born with tend to tip us into either liberal or conservative political modes.
Liberals tend to be more inclined to be feeling rather than than thinking, intuitive rather than practical, and more liberals are perception oriented, seeing both sides of a matter than black and white or concrete thinkers.
Feeling over thinking doesn't infer that liberals don't "think" and that conservatives don't "feel". They're used in psychology to denote people of different types. Thinkers prefer to make decisions based on logic, and feelers prefer to make decisions based more on immediate reaction to a situation than logical analysis.
Perception is better at dealing with people and situaitions that demand fast decision making (Like" Am I going to run into that burning building and save them or not?"), judging or concrete thinking is better for analytical decision making or working with things or mathematical concepts.
All the traits are useful ones, they just vary in how they predominate in people's personalities.
You could see how a person who is likes concrete solutions, working with things or clearly defined concepts and analysis would be able to take the "bleeding heart" factor out of politics, as they would term it, and focus on the hard facts of debt, legalistic matters, political maneuvering and analyzing political strategies and such.
An intuitive feeler who sees both sides would have a much harder time extracting the human factors out of political issues. They would be more inclined to see jobless or hungry people as needing financial assistance, wanting older people to have some security in their declining years, wanting kids to have a good education as outweighing concrete, hard core issues like the mathematics of debt and spending and political strategies and mechanics.