If Mitt Romney wins the presidential election, Paul Ryan's budget, which he endorsed, is a good guide to what he will try to accomplish. If Mr. Romney loses, the budget is a good guide to what Mr. Ryan might try to run on as a Republican presidential contender in 2016. And it's certain that President Obama and his allies will try to use the plan to attack the Republican candidates in the upcoming election. For all those reasons, writes Ira Stoll, it's worth going back and taking a careful look at what is actually in the Ryan budget. Proponents of smaller government may be unpleasantly surprised.