President Obama will have one last chance to force Judge Merrick Garland onto the U.S. Supreme Court on Tuesday — but it’s a legal gamble and one that has so many pitfalls that even those who say he could get away with it believe it isn’t worth the fight. Mr. Obama’s moment will come just before noon, in the five minutes that the Senate gavels the 114th Congress out of session and the time the 115th Congress begins. In those few moments the Senate will go into what’s known as an “intersession recess,” creating one golden moment when the president...