The same reasoning that leads Justice Scalia to conclude that the Framers' ignorance of cell phones and the Internet doesn't resolve questions about "the freedom of speech" should also lead him to the Framers' ignorance about the nature of sexual orientation. If one is going to be an "originalist," at least one should be consistent about it.
It may have taken us 100 years to get it right with respect to race-restrictions on the freedom to marry, but it doesn't mean those laws weren't unconstitutional in 1868. The same is true, nearly 150 years after the ratification of the Fourteenth Amendment, for laws that deny gay and lesbian couples the freedom to marry.
What's the significance of "corporate personhood"? This bizarre concept makes it infinitely more difficult to prosecute individual corporate wrongdoers and makes it possible for corporations to continue to dominate American politics and election spending by invoking constitutional protections intended for "real" persons.