David Blankenhorn

Founded shortly after the 2016 presidential election, the organization runs workshops, debates, and other events where red (conservative) and blue (liberal) participants come to better understand each other's positions and discover their shared values.

Blankenhorn was presented to the court as an expert witness in Perry v. Schwarzenegger by the proponents of California Proposition 8 (2008), a constitutional amendment restricting marriage to the union of opposite-sex couples.

"[15] During questioning, Blankenhorn stated "I believe that adopting same-sex marriage would be likely to improve the well-being of gay and lesbian households and their children.

Some of the benefits with which he did agree included that it would: increase the proportion of gays and lesbians in stable, committed relationships; lead to higher living standards for same-sex couples; lead to fewer children growing up in state institutions and more growing up in loving adoptive and foster families; decrease the amount of anti-gay prejudice and hate crimes; and decrease the number of those warily viewed as "other" in society, further reaching the American ideal.

[17] In the decision filed on August 4, 2010, Judge Vaughn Walker ruled that Blankenhorn was not qualified as an expert witness, and that his testimony was "unreliable and entitled to essentially no weight.

He cites "the equal dignity of homosexual love", "comity", and "respect for an emerging consensus" as positive reasons for his now supporting same-sex marriage.