Callista Louise Gingrich is an American businesswoman, author, documentary film producer and former diplomat who served as United States Ambassador to the Holy See from 2017 to 2021. She is married to former House Speaker and 2012 Republican presidential candidate Newt Gingrich.

Voters of the Republican Party elected state delegations to the 2012 Republican National Convention in presidential primaries. The national convention then selected its nominee to run for President of the United States in the 2012 presidential election. There were 2,286 delegates chosen, and a candidate needed to accumulate 1,144 delegate votes at the convention to win the nomination. The caucuses allocated delegates to the respective state delegations to the national convention, but the actual election of the delegates were, many times, at a later date. Delegates were elected in different ways that vary from state to state. They could be elected at local conventions, selected from slates submitted by the candidates, selected at committee meetings, or elected directly at the caucuses and primaries.