Proponents of gay marriage, as they eagerly anticipate the Supreme CourtÂ’s examination of the issue next week, are chortling over recent polls that suggest the American publicÂ’s resistance to it is fast eroding. They pointed this week to a Washington Post-ABC News poll in which 58 percent of Americans support gay marriage and 37 percent oppose it. This is an almost exact reversal from a decade ago, they say, when polls then showed 55 percent of Americans opposed gay marriage and 37 percent supported it.Meanwhile, establishment Republicans, who have always been ambivalent about the issue, appear ready to wave the...