The fact is, the Republican Party is less riven into ideological camps than it used to be, and the issues that used to divide it, like abortion, are less salient.
From the GOP platform:
We support a human life amendment to the Constitution and we endorse legislation to make clear that the Fourteenth Amendment’s protections apply to unborn children. Our purpose is to have legislative and judicial protection of that right against those who perform abortions. We oppose using public revenues for abortion and will not fund organizations which advocate it. We support the appointment of judges who respect traditional family values and the sanctity of innocent human life.
David Brooks is such a tool.