Biden and 2016

At The New York Times, Michael Shear suggests a reason why some potential GOP candidates will wait until 2016:

If President Obama wins reelection, there is almost zero chance that Vice President Joe Biden would run for the presidency in 2016, when he would be 76 years old. That puts him in the same place that Dick Cheney, the former vice president was in 2008. That means that Republicans who can afford to wait until 2016 can assure themselves not only that they will not face an incumbent Democratic president, but also that they won’t face a sitting vice president.