The McCain campaign has reason to be nervous about the announcement of Joe Biden for vice president. Throughout this primary season, John McCain has tried to position himself as the foreign policy expert, “man of the people” candidate versus Barack Obama’s less experienced, “elitist” candidate. McCain has proved time and time again that he’s extremely weak in foreign policy (and likely to get us into a war with Russia). And his “how many houses do I own?” gaffe of last weak punched some holes into his “man of the people” …