David Hogg’s tenure as vice chair of the Democratic National Committee may be more short-term than expected. He has been in the position for just a couple of months, but he has caused all kinds of problems for the party, mostly by announcing his plans to primary various members of the party for not being far left enough for his liking. Members of the party have already given him an ultimatum to get in line or get out, but now he may face a challenge for his own position. His challenger is another member of the DNC who happens to...