does it mean this post is obscure? unimportant?
That poverty weighed heavily upon those whose duty it was to snatch up the fallen torch. The nation beyond Washington, and the millions abroad who had regarded the murdered President as one of their own, could sink into the umbra of deep mourning. They could disregard tomorrow. The Executive Branch of the federal government could not. Already its leaders were speculating about the character of the executive mansion's incoming tenant, and on the whole they were uneasy. Until the inaugural, when he had quietly slipped into the obscurity of the Vice Presidency, Lyndon Johnson had been a creature of the Congress. On the Hill he was admired and respected, but at the other end of Pennsylvania Avenue he was an enigma. ]
what does "the obscurity of the Vice Presidency "mean?