It’s not because Akin might lose to McCaskill, costing the GOP control of the Senate. It’s not because the focus on Akin might derail the careful planning for next week’s Republican National Convention. It’s not because the focus on Akin might spill over into the presidential race, forcing Romney and Ryan to talk more about social issues than the deficit, the budget, and the economy, and perhaps costing them the White House. It’s because Akin chose what Ryan did not.