Robert F. Kennedy, Jr.,’s Nevada independent presidential petition was circulated without a vice-presidential nominee, after an employee of the Secretary of State told the campaign that the petition didn’t need to list a vice-presidential nominee. After the petition had been circulated, the state said the employee had been mistaken. See this story. The Kennedy campaign says it will sue.
There are court precedents that it violates Equal Protection to force an independent presidential candidate to have chosen his or her vice-presidential running mate early in the year, because the major parties don’t formally choose their vice-presidential nominees until national conventions, which are held in July and August.