I've already listed what Democrats should do i€n 2010, but more realistically here's how the party can maintain and even increase their majorities:
5. Accept the historical challenge that most majority parties lose big in their President's first midterm election, and realize it is mostly because those disposed to their side are disenchanted at the reality versus the promises, and complacent versus active.
The key is to amass a big victory like Healthcare reform and warn voters the Republicans are trying to take the popular benefits away.
4. The other reason majorities lose seats is that the minority finds it easy to criticize and highlight the negative aspects of anything proposed or done. Since they don't have power, they don't have to be responsible. They can at the same time have different members complain something is both too expensive, and doesn't do enough to help. Also they can talk about what they would do, without actually having to figure out how to get it through Congress. Highlight a negative aspect of the Republican agenda:
Let voters know that some Republicans hate Obama so much that if they gain seats they will use power to investigate the President no matter what.
3. Let the public know that more Republicans equals more war. T'he more there are, the more pressure on the President and more power to the Generals.
2. Pass Jobs bill that directly puts millions of Americans to work in construction, and let the people know Republicans think this is bad policy.
1. Have President Obama nationalize this election around his desire to keep changing America for the better in healthcare, financial regulation reform, and ending the Wars in Iraq and Afghanistan. A vote for any Democrat is a vote for Obama, and a vote for any Republican is a vote for obstruction. The President with a sustained effort should be able to keep his job approval at 53% or above. Then the key is to get those people out to vote. This will include many "unlikely voters" who don't show up in all the polls because they aren't routinely interested in politics.
As you can tell, voters typically vote against more than voting for. Fear trumphs policy and ideas. Deal with it up front.