Identity politics is a phrase that is traditionally reserved for studying politics of third world nations with deep ethnic cleavages like India and Fiji. It is rarely used in the context of American politics yet identity politics is rife in America.
More boldly, I would like to say that in fact all politics is identity politics and the relative success of parties can be solely judged on how successful they have been in peddling robust identities. I use the word “robust” because it is important that identities be “essential”, and fundamental to how one sees himself and hence immune to pressure (or logic) unless of course your identity is based on being data driven. I make this claim because there is a vast literature in political science that lays bare the abysmally low levels of information in general population and it reasons hence that people must make decisions based on identity affiliation, an assertion that largely bears out in the data.
There are two caveats to the claim that I am making – one is that very few political identities are infinitely tensile – they eventually brook to contrary evidence. Identities can be resilient and make people delusional but often times they have limits. Secondly, political identity for many is a shifting idea determined by what is sexy (a reference to meaningless radical positions held by students), and by what is appropriate or comfortable or stokes one’s prejudices the right way (for example – people don’t ever explicitly call themselves racist. they just feel that all black people are lazy and deal in drugs. and that is true isn’t it – Bill O’Reilly certainly thinks so)
A measure of success would involve percentage of partisan media one consumes. Identity politics involves a reshaping of the kind of media one consumes, the kind of messages one gets from it, and how s/he chooses to interpret them and “update” (in a Bayesian way) their thinking.
The law of stable yields
Identity politics is the only that is capable of yielding stable yields and creating a strong unwavering kernel. It is no surprise hence the party in power in US is the one that has had considerably more success in engaging in identity politics.