Graham actually agrees with you; the essay quoted above continues:
But this isn’t true. There are certainly some political questions that have definite answers, like how much a new government policy will cost. But the more precise political questions suffer the same fate as the vaguer ones. I think what religion and politics have in common is that they become part of people’s identity, and people can never have a fruitful argument about something that’s part of their identity. By definition they’re partisan.
Graham actually agrees with you; the essay quoted above continues: