evidence: Senate Republicans’ decision to vote on Justice Ruth Bader Ginsburg’s successor reflects individual and collective cost-benefit calculations of seating a rock-ribbed conservative in what may be the Trump administration’s waning days. As a fig leaf to obscure the hypocrisy of voting on President Trump’s election-year nominee after refusing to vote on President Obama’s in early 2016, Republicans have claimed an historical norm that doesn’t exist. [...] Last year, given the lack of any "long-standing tradition" but anticipating the possibility of an election-year vacancy, McConnell fabricated a different history to justify treating a Trump nominee differently from Obama’s. He argued that "[y]ou have to go back to … 1880s to find the last time … a Senate of a different party from the president filled a Supreme Court vacancy created in the middle of a presidential election. That was entirely the precedent." When that anticipation became reality with the death of Justice Ginsburg, he offered a slightly different excuse: "Since the 1880s, no Senate has confirmed an opposite-party president’s Supreme Court nominee in a presidential election year". A National Review article claimed a norm: "when their party controls the Senate, presidents get to fill Supreme Court vacancies . . . [but] when the opposite party controls the Senate, the Senate gets to block Supreme Court nominees . . .".