California Democrats are panicking as a crowded and uninspiring field of gubernatorial candidates is raising the real possibility two Republicans to advance out of the June primary. The prospect of the “zombie campaigns” leading to a Republican governor for the first time since Arnold Schwarzenegger left office in 2011 has created a “sh—show,” one Democratic state legislator told The Post. “I’ve never seen a big race like this before,” the legislator said. “And I am worried that we’re going to have two really whacko Republicans.” As hundreds gathered this weekend for the California Democratic Party convention in San Francisco, another...