The Lib Dems and the Greens both explicitly supported gay marriage in their manifestos.
Labour & the SNP ‘will consult’.
The Tories, somewhat behind the curve on social issues as usual, are silent on the matter.
Salmond, in many many ways, *is* the SNP. If he had supported gay marriage being included in the SNP manifesto then it would have been so its a shame that its only now he has mentioned it.