Two of the brightest rising young stars in American conservatism today are Paul Ryan and Marco Rubio. Neither are running for president in 2012, but both will be strong contenders for the vice presidential running mate slot, whoever wins the Republican nomination. And I wouldn’t be surprised to see Ryan or Rubio eventually sitting in the Oval Office itself at some stage in the future. After all, Congressman Ryan of Wisconsin is only 41, and Senator Rubio of Florida is just 40; they have decades of public life ahead of them. They are both deeply principled politicians in the Reagan mould who grew up during the late Cold War years, and share a profound belief in American exceptionalism and the need for the United States to maintain its position as the world’s leading power.