For the first time, President Barack Obama's "disapproval" number has gone above his "approval" rating in Gallup's daily tracking poll.

— The percentage of those polled who "disapprove" of the job he's doing: 47%.

— The percentage who "approve": 46%.

Here's what the fever lines look like:

For the first time in Gallup's daily
Enlarge Gallup.com

The lines have crossed.

For the first time in Gallup's daily
Gallup.com

The lines have crossed.

Gallup, of course, is one of the big names in polling. But as Pollster.com's charts show, many other survey firms have been showing Obama in "negative" territory a couple weeks now.

How does Gallup do its tracking poll? You can read about it here.