Can Asteroid 2012 DA14 Hit the Earth?

In the wake of the 11-ton meteor that fell in Russia's Ural Mountains, injuring 900 people as it entered the Earth's atmosphere at a speed of at least 33,000 mph, many are wondering if we're as safe as NASA claims as 150-feet across Asteroid 2012 DA14 approaches our planet. One of them is Astronomy and Astrophysics professor, Neil F. Comins, who recomends not to ignore the effects of Asteroid 2012 DA14 because "we are not always right."  

What if the asteroid's path were to change today? What if our predictions were devastatingly wrong?