If the polling data is accurate, no.
And it would be my personal desire to not have gays call their 'arrangements' marriage.
I'm VERY concerned with the idea that the Federal government should define and regulate marriage. Regulate is what they do, after all...
Ideally, the gays would back off and choose another name.
Depending on the wording, and given IRONCLAD assurances there would be no interpretations allowing for the expansion of government law, or the ability of the courts to make new law from the Amendment, (For example Federal conditions for a Federal marriage license - did you consider that?) then I might vote for it.