A socialist, an atheist, and a Muslim.

Ah! I've unwittingly written a "Jeopardy"-style answer. Now, you tell me the question!

ADDED: You could also take it as a Karnak answer.

WE HAVE A WINNER: Irene says: "Which affiliation do most Americans agree would disqualify a person from nomination to the US Supreme Court?"

Yes, there is a new poll about replacing Justice Stevens, and in one part of it, Americans are asked if they would be "comfortable" with various sorts of nominees. Here's the PDF of the results. A socialist, an atheist, and a Muslim are the 3 types of nominees that a majority of Americans would not be "comfortable" with. 64% were uncomfortable with the socialist (though Democrats were split 47/47%). 58% were uncomfortable with an atheist, including a majority of both Democrats and Republicans. And 53% were uncomfortable with a Muslim (though only 45% of Democrats had a problem). Interestingly, in contrast to the socialist, libertarians did pretty well. 57% were comfortable, including 53% of Democrats. The poll also asked about Mormons and Christians who take the Bible literally. Both of those types did quite will, with 65% and 62%, respectively, feeling comfortable.