Is same-sex marriage good for children?

Today, on radio SAFM interview on Same-Sex Marriage, a caller asked for evidence that 'same sex marriage' is harmful to children.Studies show that children with both a mother and a father are on average the most successful.  Those with a single parent come next and those with two parents of the same sex are the least successful.Most academic writings on the subject are only available hard copy (not on the internet), but here is a web link with a helpful summary of information: http://www.family.org/cforum/fosi/marriage/ssuap/