... And now Mark Warner supports SSM

[Mr. Morden]

What about Cowan?  I assume he supports SSM, but has anyone ever asked him about it?  He was appointed to the Senate about two seconds ago, so he might not have ever said anything about it.  (And Wikipedia's list of supporters doesn't include him.)

[Mr. Morden]

• I counted Carper, Kaine, and Rockefeller as supporters; they haven't explicitly endorsed gay marriage, but have made statements that make their beliefs somewhat obvious (and all three signed onto an amicus brief arguing that DADT be overturned in full)

I predict that Kaine will make an unambiguous statement in favor of it in the relatively near future.  Warner favoring it now gives him additional cover.  He wants to preserve his viability as a potential VP pick for Hillary Clinton in 2016.