The last time presidential candidates gathered to address LGBTQ issues specifically was 2007. Since then, there’s been a sea change in rights and acceptance. When 10 of the Democratic candidates for president gather in Iowa on Friday evening, it will be at a forum to address issues that are top of mind for one of their party’s most reliable constituencies: the lesbian, gay, bisexual, transgender and queer community. The candidates — Joe Biden, Cory Booker, Pete Buttigieg, Julián Castro, Tulsi Gabbard, Kamala Harris, Amy Klobuchar, Joe Sestak, Elizabeth Warren and Marianne Williamson — will take the stage at Coe College...