Former Florida Gov. Jeb Bush, a Republican who helped usher in a strong standards-and-accountability system in his state (which included letter grades for schools and vouchers), will not run for the U.S. Senate, he just announced in a statement.

This puts to rest speculation that he would seek the seat being vacated by Sen. Mel Martinez.

In the statement, Bush says there’s no “greater calling than education reform.” Since leaving the state’s highest office, he’s been helping pursue the education reform agenda he started in his state through two foundations he now runs. That includes his continuing pursuit of vouchers.