Interviews with more than 25 GOP strategists and party officials depict a president whose avuncular style and genial bearing make him a less-than-ideal foil. He doesn’t induce anger or rage, and at the moment, his White House is relatively drama-free. In response, Republicans are preparing to break with time-honored custom and cast the president less as the central character in the midterm elections than as an accessory to the broader excesses of the left. “Biden is not a good bad guy,” said Ed Rogers, the veteran Republican lobbyist and strategist. “Obama was a haughty professor … The Uncle Joe life story that he has — the tragedy, the losses, the obvious empathy the man has, I think that’s all legit. So, it’s hard to demonize him.”... “Because [Biden] is so boring, he’s not as scandalous,” said John Thomas, a Republican strategist who works on House campaigns across the country. Though Biden “certainly is relevant” as the head of the party in power, Thomas said, “there are bigger bogeymen … We don’t need him as our No. 1 foil.”