Yes, because we haven't been doing baby steps for a long time now.
Frankly, Gaborn is wrong about Obama on gay rights as a whole; Obama is wrong on civil unions vs. marriage, but right on the appointment of judges, anti-discrimination laws, hate crime laws, the repeal of DADT and DOMA, gay adoption, and so forth.
Look, I would have more faith in the civil unions --> marriage 5 - 10 years down the road method if straight people weren't so completely unreliable in the strength of their support. Unfortunately, as any argument in this series of topics around civil unions vs. marriage will show you, the vast majority of the straight people (and even some of the gay people) stop caring once you reach civil unions - and their support is necessary.
If you could convince me that civil unions will lead to marriage more quickly than without doing civil unions first, I'd agree with doing that, but it just feels incredibly risky.