"Presumably, every Democratic primary voter has some core values that any candidate must at least nominally endorse to get their support. What makes one position a “value” and another a “purity test”? Given the confusion caused by this and other terms, and as an aid to the general public, here’s a guide to centrist terminology. Purity Test --Certain words and phrases are routinely used by “centrist” political candidates. By design, these terms are imprecise, emotionally charged. Rep. Alexandria Ocasio-Cortez fired back to Buttigieg' use of the term “purity test”: “For anyone who accuses us for instituting purity tests,” she said, “it’s called having values. It’s called giving a damn.”