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

 
-Wall Street ends in the red as the deadlock in Washington's debt negotiations leaves investors uncertain whether the U.S. can avoid a default or a credit downgrade.
 
-The Dow Jones Industrial Average falls 88 points to 12,593.
 
-European bond markets fall after Moody's Service cuts Greece's credit rating three notches deeper into junk territory, warning that the country's latest bailout deal implies a default.  That assessment echoed the view of Fitch Ratings on Friday, and is expected to be followed by Standard & Poor's.
 
-CME Group is raising the amount of collateral required to trade its Treasury futures contracts,  as the U.S. debt crisis promised to intensify market volatility.
 
-Gold closing at a new record high of $1,612/ounce.