In 2008, Barack Obama and Brendan Eich both were against gay marriage. Senator Obama averred his support for the one-man/one-woman view of marriage, while Mr. Eich, a cofounder of the Mozilla web-browser company, donated $1,000 to support Proposition 8 — a California ballot initiative that had the effect of making Senator Obama’s avowed marriage policy the law in California, at least until a federal court overturned it on the theory that California’s constitution is unconstitutional. Barack Obama inexplicably remains, as of this writing, president of the United States of America, but Mr. Eich has just been forced out as CEO...