In Los Angeles, some Occupy protesters are refusing to leave their camp near City Hall — despite a midnight deadline. The LAPD is being praised for its patient approach to the situation.

The Democratic National Committee released an Obama campaign ad Monday suggesting that Mitt Romney's worst enemy is Mitt Romney. The TV ad, airing in targeted markets in five swing states — including Ohio and Pennsylvania — highlights Romney's evolving positions on such central issues as health care, abortion and bank bailouts. It suggests Democrats assume Romney will be the nominee and indicates their plan of attack for the year.

Democratic Rep. Barney Frank announced Monday afternoon that he will not seek re-election next year. Among the strongest voices for liberals in Congress, Frank was co-author of the Dodd-Frank Act, the most stringent regulations on the banking industry since the Great Depression.

Guy Raz talks to Howard Bryant, senior writer for ESPN.com and ESPN the magazine, about the cult of Denver Broncos quarterback Tim Tebow.

In the mid-'90s, the big banks set up the Mortgage Electronic Registration System, or MERS, to track mortgages as they're traded by investors in mortgage-backed securities. It's a system set up to let banks skip the process of paying recurring filing fees at county courthouses each time a mortgage was bought or sold. Now, many cash-strapped local governments, big and small, are filing lawsuits against MERS. Politicians contend their communities are owed millions of dollars.