In an editorial at CNN.com:

Last year alone, NASA discovered flowing water on Mars and evidence of ice on one of Jupiter’s moons, and we mapped Pluto – more than 3 billion miles away – in high-resolution. Our space telescopes revealed additional Earth-like planets orbiting distant stars, and we’re pursuing new missions to interact with asteroids, which will help us learn how to protect the Earth from the threat of colliding with one while also teaching us about the origins of life on Earth. We’ve flown by every planet in the solar system – something no other nation can say. And we continue to drive down the cost of space exploration for taxpayers.