She married Rhode Island Governor William Sprague, a textile magnate, on November 12, 1863 (the social event of the season) at Chase's home in Washington. Sprague's wedding gift to her was a tiara of matched pearls and diamonds that cost more than $50,000. As the bride entered the room, the U.S. Marine Band played "The Kate Chase March" that composer Thomas Mark Clark had written for the occasion. President Lincoln attended the reception, but his wife, who strongly disliked both of the Chases, did not.