Mark Lasseigne fills you in on what's happening on Wall Street.

-Wall Street ends again in the red.
-The Dow Jones Industrial Average fell 91 points to 12,501.
-Financial markets began seriously assessing the prospect of a downgrade of the U.S.'s triple-A credit rating.
-Investors also digested a slew of mixed earnings reports.
-Crude-oil settled at $99.59/ barrel.
-Gold again closing at a new high of $1,617/ounce.