In the early stages of the undeclared race for the Republican presidential nomination, Mitt Romney is the frontrunner. The former governor of Massachusetts has the best-developed national network of supporters of any of the potential candidates. He is the one doing the most party-building across the country; of his potential rivals, only Minnesota governor Tim Pawlenty comes close. He is the one to whom other Republicans are most likely to turn for answers on economic policy, and on many issues he is the only one giving them. When the auto companies came to Washington only Romney had a plan (“Detroit...