LInda Greenhouse writes about Sandra Day O'Connor--two bits struck me: "Imagined communities" are the groups we think we belong to,
“Those who would renegotiate the boundaries between church and state must therefore answer a difficult question: Why would we trade a system that has served us so well for one that has served others so poorly?” Here O'Connor is writing an opinion, and her "we" refers to "Americans".
“I guess you know Senator McCain pretty well,” I ventured. Her response was instantaneous and almost fierce. “I do not,” she declared. “I’ve met him, but I don’t know him. He’s a newcomer to Arizona.” (Unlike Barry Goldwater, born in the Arizona Territory before statehood, John McCain had moved to Arizona after his discharge from the Navy in 1981.) Here Greenhouse is trying indirectly to find who O'Connor voted for in 2008 (and takes Greenhouse's reaction as indicating she voted for Obama.) Here I think O'Connor is identifying herself as a "true Arizonan", in contrast to the newcomer McClain.
I liked the way there were two examples of how the psychology of imagined communities works in the one article. Note in the McClain example she's excluding, establishing a boundary, while in the religious example she's more appealing for people to include themselves.