The Supreme Court’s announcement Friday that it will consider two major same-sex marriage cases in its next session ensures that the issue will be front and center in the first six months of 2013. Regardless of how the Court rules on these two cases, however, public opinion on gay marriage — and the politics surrounding the issue — are headed in a very clear direction. Here’s a look at data from Washington Post-ABC News polling on the question since 2004...It doesn’t take a professional pollster to understand what the chart tells us. In 1996, as the country was easily re-electing Democratic President Bill Clinton, two-thirds of the public opposed gay marriage. Sixteen years later, as the country was re-electing Democratic President Barack Obama just 43 percent opposed it while 48 percent favored it. Go deeper into the Pew numbers — and thanks to Pew, you can! — and you see why those trend lines won’t be reversing themselves. In 2011-2012, 62 percent of people 18-29 supported gay marriage — by far the strongest support among any age group. During that same time period, just 32 percent of those 65 or older supported gay marriage.