Noah Millman makes the case for the legislature:

When a legislature deliberates, it takes into account not only the preferences of the citizenry, but the intensity of those preferences. If a majority opposes an action, but a minority supports it much more strongly, there is a good chance that the action will be taken – and this may well be a proper result, because the benefit to the minority may vastly exceed the cost to the majority. Moreover, the legislature has the freedom to act as it sees fit, and then wait to see whether apparent opposition dissipates before the next election. It has the leisure, in other words, to deliberate.

Relatedly, Kornacki considers the politics of Chris Christie's marriage equality veto.