WASHINGTON (CNN) -- There are likely to be two hot-button issues in Judge Sonia Sotomayor's Supreme Court confirmation hearings as senators gauge not only her positions but also some controversial comments she has made.

Issue No. 1: Abortion. It is the traditional hot-button issue in Supreme Court confirmation hearings.

Issue No. 2: Same-sex marriage. Four states -- Connecticut, Iowa, Maine and Massachusetts -- allow same-sex couples to wed. New Hampshire could soon follow with legislation pending before the state Legislature. Vermont has also legalized same-sex marriage.