Now that the oral arguments before the US Supreme Court over the two same-sex marriage cases are over, there has been a ton of commentary and analyses.
This article has a nice brief summary of the legal arguments and what the justices seemed concerned about.
This link gives you directions to find out more on each and every aspect of the cases.
This article compares the arguments made against same-sex marriage with those that were made against inter-racial marriage in that earlier landmark case. The alleged negative effects on children were brought up then and now by opponents of inter-racial and same-sex marriage.