Climate change was a point of division between Obama and Republican rival Mitt Romney. The president declared climate change a global threat, acknowledged that the actions of humanity were deepening the crisis, and pledged to do something about it if elected.

We're living in an era of unprecedented change, and I want to be a part of documenting it.

It's an appeal as old as America and its presidency: This is an extraordinary country populated by hard-working, big-dreaming, freedom-loving people graced by God when they're not pulling themselves up by the bootstraps.

If history is a guide, a victory for Obama means he faces the prospect of a second term dogged by scandal or inertia.

A concrete agenda and landslide victory might not even guarantee a president his mandate in a capital as polarized as Washington.

Political consultants are pugilists, masters in the dark art of negativity. Which is why it's surprising to hear Democrats such as Steve McMahon and Republicans like Rich Galen urging their presidential candidates to be more, well, positive.

President Obama is casting his lot in the middle of a debate as old as America itself: Are we rugged individualists pulling ourselves up by the bootstraps? Or are we a nation of community, all connected and counting on one another?