On December 16, the U.S. Supreme Court revealed that it has refused to hear Libertarian Party of Michigan v Ruth Miller, 13-442. This is the case over whether Gary Johnson should have been on the Michigan ballot as the Libertarian nominee in November 2012.
The U.S. Supreme Court has not agreed to hear any election law case brought solely by a minor party, or an independent candidate, or their voters, since 1991, if that minor party or independent candidate had lost in the lower court. The only exception is a case from Georgia in which a Libertarian nominee was kept off the ballot because he had refused to take a test for illegal drugs, in defiance of a state law that did not permit candidates to get on the ballot for state office unless they took a urine test.
Here is a short news article about the denial.