According to The Commission on Presidential Debates (CPD)'s website, the 2016 criteria requires a candidate to be "Constitutionally eligible," to appear on enough state ballots to have "a mathematical chance of winning a majority vote in the Electoral College," and to "have a level of support of at least 15 percent of the national electorate as determined by five selected national public opinion polling organizations" sometime after Labor Day, "but sufficiently in advance of the first-scheduled debate to allow for orderly planning."
Gary Johnson has polled constantly in the double digits this past month and had official national poll as high as 13%. Double digits should be a large enough number of supporters to make a case for the American people. Let's get Gary in the debates!