Not surprisingly, our junior U.S. senator joined an effort late last night to tack an amendment onto health care reform legislation that would require the District of Columbia to hold a referendum on same-sex marriage. Chris Geidner at Law Dork reports that the amendment, introduced by Utah Republican Sen. Bob Bennett, was defeated in the wee hours by a roll call vote of 36-59. Sen. John Cornyn of Texas, who once equated gays to “box turtles,” was one of the backers of the amendment. Bennett’s proposal was one of many “poison pill” measures that Republicans tried to attach to the reconciliation package, in an effort to force the House to vote on health care reform again. While Bennett’s amendment failed, DCist notes that it’s probably not the last time we’ll see an effort in Congress to reverse marriage equality in D.C. And if and when it comes up again, I’m sure Cornyn will be among those leading the charge.