One of the great political memes of the Trump era was that Maine’s moderate GOP Sen. Susan Collins is “concerned” over the president’s latest extreme action — even as she continued to vote in lockstep with a GOP dominated by the Former Guy. But one thing that Collins insisted she wasn’t concerned about — even as Donald Trump tilted the Supreme Court to the far right with his three appointments — was the fear that the new justices might vote to overturn Roe v. Wade, the landmark 1973 ruling that legalized abortion nationally. Collins — who had trumpeted her support for abortion rights in winnin…