It's not a particularly tasteful analogy but Jonathan Martin and Mike Allen at Politico are comparing the deadlocked race for the Democrat nomination to the First World War:
"The Democratic race has entered its World War I phase, a bloody fight between two adversaries making only the most incremental of gains. And there is no reason to think either side will emerge from the trenches anytime soon...
So on June 3, when South Dakota and Montana end the current voting calendar, the contours of the race aren't likely to be much different from what they are today. That means 2 1/2 months of conference calls, attacks, counterattacks and millions of dollars spent, all to move the political needle just a few inches...
“The primary race is no longer about Democratic ideas or policy initiatives — it's about process, and that is the last thing you want your candidate talking about,” said another Democratic strategist and veteran of Sen. John F. Kerry's campaign. “This is increasingly in the hands of the superdelegates, whose minds can change on a daily basis. What started out as a better path to a faster nomination has resulted in a party without a nominee and a ticking clock.”"