President Barack Obama's top political adviser says lobbyists are gathering on Capitol Hill "like locusts" to try to derail health care legislation.

But David Axelrod says he's confident the overhaul will soon become law, but it will be a struggle.

He says the public understands that "this is the moment" for major changes to the country's health care system -- and things will only get worse if Congress fails to act.

Axelrod tells CNN's "State of the Union" that insurance industry lobbyists have "landed on Capitol Hill like locusts" and will be doing everything they can to try to defeat health care legislation.