A man whose speech defending same-sex marriage went viral in 2011 has announced his bid for an Iowa State Senate seat. Zach Wahls, who was 19 when he made the viral video, gave a powerful speech to the Iowa House of Representatives’s Judiciary Committee about growing up with two moms. The video was YouTube’s most-watched political video that year. Wahls, now 26, is running as a Democrat to fill the Iowa State Senate seat for the 37th District, which will be vacated by Democrat Bob Dvorsky, who is not seeking reelection. Wahls announced his campaign on Twitter on Dec. 21,...