Not so in the United States. Here, parties in their out-of-power years tend to slip into low-grade civil wars, with rival camps inside Washington and various warlords — er, governors — squabbling on the periphery. Not coincidentally, the parties tend to look their worst during these periods: fractious and solipsistic, intellectually confused or ideologically extreme, with opportunists grabbing for the megaphone at every opportunity. The Republican Party has been effectively leaderless for almost six years, ever since the 2006 midterm elections made George W. Bush’s lame-duck status official. John McCain was so mistrusted by conservatives that he probably would have felt like an interim figure even if he hadn’t gone down to defeat in 2008, and after the general Republican rout that year, the party’s public image was suddenly defined more by media personalities — from Rush Limbaugh to Glenn Beck — than by any of its elected officials. The Limbaugh-Beck moment passed, but the vacuum remained — and for most of his two years of campaigning, as a primary candidate and then as the Republican nominee, Mitt Romney conspicuously failed to fill it. He seemed content to take his party as he found it, and to conform rather than to lead: in the primaries because conformity was the safest way to reassure his critics, and in the general election because his campaign apparently believed that a generic Mr. Republican would be able to glide to victory in the fall. That finally changed in the first presidential debate. In 90 prime-time minutes, the country had a glimpse of what our politics might look like if the Republican Party actually had a leader again. What Romney executed on Wednesday night was not just a simple pivot to the center, as much of the post-debate analysis suggested. Pivot he certainly did — stressing bipartisanship and touting his record as the moderate governor of a liberal state, backing away from the more implausible spending cuts implied by his budget promises, explicitly breaking with the idea that upper-bracket tax cuts can be a self-financing free lunch. But this wasn’t some sort of Sister Souljah moment, where Romney called out his fellow conservatives in order to curry favor with the center. Rather, what he did was clarify, elevate and translate. He clarified what kind of tax reformer he would be, by promising that revenue neutrality would take priority over sweeping cuts for the rich — a premise that plenty of Republicans are already happy to accept. He elevated an argument that’s increasingly popular among conservative wonks — that the Dodd-Frank financial reform perpetuates “too big to fail” — and used it to make a populist case against the president. And he translated the basic free-market vision to a nonideological audience, by talking more about decent jobs than heroic job creators, and more about the struggling middle class than about the supposedly persecuted John Galts. This is the role that an effective party leader ought to play. Media fantasies notwithstanding, you can’t lead a party by repudiating its base or campaigning against its reigning ideology. But you can lead by channeling the base’s passions in a constructive direction, and by reinterpreting the party’s ideology to meet the challenges of the present day. One debate does not such a leader make. But at the very least, the fact that Romney’s strategy worked so effectively last Wednesday — that it made him seem mainstream and appealing while also winning him plaudits from almost every sort of conservative — suggests that the Republican Party can actually be led, and that its politicians don’t have to be prisoners of talking points and groupthink. Indeed, the party may actually be ripe for such leadership. Cut through the Kabuki narratives on the contemporary right — the grass roots versus the establishment, the True Conservatives versus the RINOs — and you’ll find that what conservatism actually stands for, issue by issue and policy by policy, is more up for grabs than at any point since the Reagan revolution. The Reagan nostalgia, the fears of looming socialism, the paranoia about a shiftless 47 percent: They are all symptomatic of a party on the brink of transition rather than one incapable of change. Republicans seem to be clinging to the past mostly because their leaders haven’t shown them what they should stand for in the present. The only question, as we head into the final four weeks of the campaign, is whether Mitt Romney has realized this a little bit too late.