The Marriage Unique for a Reason blog run by the U.S. Catholic Bishops gives five reasons Catholics should support the March for Marriage -- here's the first reason:

1. When Pope Francis was archbishop of Buenos Aires, he encouraged the Catholic faithful to march for marriage. The year was 2010 and the Argentinean legislature was debating whether or not to redefine marriage. According to Zenit news, then-Cardinal Bergoglio “appealed to parish priests, rectors and chaplains of churches to facilitate the participation of the faithful” in a planned march and demonstration against redefining marriage. The marchers united under the motto “We want a mommy and daddy for our children” and Cardinal Bergoglio encouraged them to keep the tone positive. Read more about Pope Francis’ defense of marriage and family during his time in Buenos Aires.