"Senator Max Baucus of Montana, the chairman of the Finance Committee, will retire from the Senate after 36 years..."

"... becoming the sixth Senate Democrat to leave the chamber in the 2014 elections, according to Democratic officials close to the senator."

[T]he Democrats will now be defending open seats in Iowa, Michigan, Montana, New Jersey, South Dakota and West Virginia.

Seeing the news this morning, I felt I already knew that. I had to look up what I'd written a few days ago about Baucus (when he called the implementation of Obama care "a huge train wreck coming down").  That referred to an article that had this paragraph:

A six-term veteran, Baucus expects a tough re-election in 2014. He’s still trying to recover from approval ratings that nosedived amid displeasure with the health care law in his home state.

So do the Democrats risk losing the Senate?

During the last midterm elections in 2010, the GOP picked up a net six senate seats.