Two central facts give shape to the historic 2010 election. The first is not understood by Republicans, and the second not admitted by Democrats.
The first: the tea party is not a “threat” to the Republican Party, the tea party saved the Republican Party. In a broad sense, the tea party rescued it from being the fat, unhappy, querulous creature it had become, a party that didn’t remember anymore why it existed, or what its historical purpose was. The tea party, with its energy and earnestness, restored the GOP to itself.