But the party’s establishment is also factionalized—no candidate succeeded in uniting it in either 2008 or 2012, even though Romney was a clear establishment favorite.
...
There’s another potentially unifying mainline conservative, though, and he lurks in Madison. Scott Walker, the battle-hardened governor of Wisconsin, is the candidate that the factional candidates should fear. Not only does he seem poised to run—he released a book last week—but he possesses the tools and positions necessary to unite the traditional Republican coalition and marginalize its discontents.
Walker has the irreproachable conservative credentials necessary to appease the Tea Party, and he speaks the language of the religious right. But he has the tone, temperament, and record of a capable and responsible establishment figure. That, combined with Walker’s record as a reformist union-buster, will appeal to the party’s donor base and appease the influential business wing. Walker’s experience as an effective but conservative blue state governor makes him a credible presidential candidate, not just a vessel for the conservative message. Equally important, his history of having faced down organized labor and beaten back a liberal recall effort is much more consistent with the sentiment of the modern Republican Party than Jeb Bush’s compassionate conservatism. Altogether, Walker has the assets to build the broad establishment support necessary for the fundraising, media attention, and organization to win the nomination. He could be a voter or a donor’s first choice, not just a compromise candidate.
...
Of course, Walker's not even assured of winning reelection. And Christie has a head start in the invisible primary. But on paper, Walker’s a very credible candidate—even a great one. Mainline conservatives with hesitations about Christie seem likely to give Walker a serious look. Ultimately, he’d need to take advantage of that opportunity, and prove he’s as strong in practice as he is in theory, by performing well in the debates, building a capable campaign, and building support in Iowa. But so far, there’s no reason to think he can’t. If he does, he’ll be the Republican frontrunner.