Barack Obama’s campaign manager assured House Democrats Wednesday that the party’s presumptive presidential nominee wants their input and will work seamlessly with them in the fall to produce a bigger House majority.

After David Plouffe addressed the caucus, Rep. Jan Schakowsky, D-Ill., said, “It was a brilliant presentation of ways to get to 270 electoral votes and how the presidential race intersects with House races, and how much synergy there will be.’’

In recent weeks, there has been some behind the scenes grumbling among congressional Democrats that the Obama campaign has not done enough to reach out to them for input. But Schakowsky, an early Obama backer, said, “What people are waiting for is marching orders. There is an organizational period but every member is important to the campaign.’’

Obama has assembled a congressional liaison team headed by longtime House aide Phil Schiliro, who attended Wednesday’s session.

Another longtime Obama backer, freshman Rep. Paul Hodes, D-N.H., said that in his state the Obama campaign has already started coordinating its activities with him and another freshman, Rep. Carol Shea Porter. “Both Shea Porter and I endorsed Obama. You can see the strength of organization that the campaign has in New Hampshire and the degree of coordination we are already seeing in Washington and in New Hampshire,’’ Hodes said.

In his presentation, Plouffe pointed to 18 battleground states, some of them non-traditional Democratic targets such as Colorado and Montana, where Obama will make a concerted effort against Sen. John McCain of Arizona, the prospective Republican nominee. Plouffe also told the members that the Obama effort will emphasize its grassroots effort, driven by 1.8 million donors and some one million volunteers already signed up.

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