I think anytime a person gets over attached to a particular codified belief system, ideology, and/or group and starts to label themselves as this or that, it tends to become inherently limiting and/or separatist in nature.
I'm a (non religious) fan of Yeshua (Jesus), but there is no real need to call or think of myself as a Christian. I like/respect some other teachers as well, but for whatever reasons i'm most drawn to him, his life and example.
Liberal, conservatives, libertarians, tea party, socialist, communist, etc, etc all are just words for relative truth, relative inaccuracy, narrowing of perception and needless conformity, and again often with the tendency to facilitate separateness with other groups and individuals different than that self chooses to align with.
Someday, we will all come to know beyond a doubt (and deeply care about), that we all are truly and fully interconnected and part of a larger, One self while individual and unique at the same time. Nothing wrong with expressing that uniqueness and individuality, but when you start to see or foster separation, that's when you will experience suffering. Since i suffer some sometimes, i let self get stuck too at times, so i'm not sitting in judgment of others here, just trying to point out how the system/process works whether one likes it or not (or is aware of or believes it or not).
It's an amazing feedback process that was either built into the system, or the system evolved too, wherein specific degree of selfishness leads to specific degree of pain and suffering, and specific degree of attunement to Love and all that is creative in essence, leads to specific degrees of enjoyable states of being like joy, at peaceness, calm centeredness.
(much over simplified for the sake of brevity, because i know first hand that crappy diet, health lifestyle, body accidents, etc, etc can lead to much depression or other non enjoyable emotional/mental states through imbalancing the body, even if the person is basically an ethical, more loving or kind person in intent and essence. And in these cases, if the body imbalance can corrected, much of these non enjoyable states will be changed and often even dramatically--speaking from first hand experience).