What is something attractive about Liberal men or women?

Physical attractiveness is certainly a factor, but can fade or be over shadowed by other things. Traits like personality, character, rational decision making, communication, and accountability tend to be more enduring factors impacting compatibility.

People more to the center of either political side can usually do fine together if the other factors align. IF either are at the extreme, I think the chance for success erodes as quickly as the ability to tolerate different opinions.