The article does point out that another poll showed a slim majority supporting the amendment to ban gay marriage.
No matter how you slice it in the short term, though, the long term trend is crystal clear.
Note that those opposed are overwhelmingly religious people and older people. I've been saying here that religion and tradition are the basis for most arguments against gay marriage, and I see that borne out in this poll. It should be noted that state and federal courts generally have not upheld arguments that any individual's or group's rights could be curtailed on the basis of other people's religion or tradition, in the absence of some compelling state interest. Obviously, most rights are not absolutes, but there has to be some "clear and present danger," for example, to justify limits on rights. Courts are becoming increasingly consistent in applying that logic to this issue, as the "clear and present danger" argument looks increasingly homophobic in the absence of any evidence to support it.
Click on the graphic/button atop the Chron. article (right side) to see some graphs that demonstrate most clearly that support for gay marriage increases as age decreases. In other words, it's a clear, straight line - the older you are, the more likely to oppose gay marriage, and the younger, the more likely to support it. This trend suggests that gay marriage is an inevitability, I think. Courts are out ahead of public opinion here, but public opinion will catch up as the older folks... um... expire... and the younger generations will wonder what all the fuss was about.