Falling like a rock:

Rasmussen Reports has a detailed graphs showing how President Obama's job approval index has plummeted since taking office.  In fact his job approval index has taken one of the fastest dives in history and has been below 50% for 3 straight months!  These numbers are an average of their daily tracking polls.

Rasmussen also uses the "Approval Index" and that number as well has taken a nose dive!  The approval index is determined by subtracting the Strongly Approve minus the Strongly Disapprove.