Just updated:
Democrats
Strong Dem
Delaware
Illinois
Massachusetts
Michigan
New Jersey
Rhode Island
Likely Dem
Arkansas
Iowa
Montana
South Dakota
West Virginia
Virginia
Lean Dem
Louisiana
Minnesota
Colorado
New Hampshire
Oregon
Nebraska
New Mexico
Republicans
Strong GOP
Alabama
Alaska
Kansas
Mississippi
Oklahoma
Texas
Wyoming
Wyoming
Likely GOP
Georgia
South Carolina
Lean GOP
Kentucky
Maine
North Carolina
Tennessee
Idaho
Here's the latest map:
Why do you list several Republican incumbents in the "Lean Dem" pile? As of right now, every non-scandal tarred incumbent begins the 2008 campaign with an edge. Even ethically challenged Conrad Burns nearly crawled back from a double digit deficit in the polls.
Those are Democratic states, and of those states, most of them are retirements, so there is no incumbent.