Cover the Uninsured Week, a nonpartisan campaign organized by the Robert Wood Johnson Foundation, starts today with events across the country.

Now in its fifth year, Cover the Uninsured Week advocates health coverage for all Americans. An estimated 45 million Americans lack health insurance, according to event organizers.

As part of the observance, volunteers throughout the U.S. will help to enroll eligible children in the State Children’s Health Insurance Program, which administers preventive-care projects and assists businesses that want to help workers cover their families.

In addition to the Robert Wood Johnson Foundation, organizations sponsoring Cover the Uninsured Week include the U.S. Chamber of Commerce, AFL-CIO, Healthcare Leadership Council AARP and United Way of America.

Congress is currently considering a bill to reauthorize SCHIP, which provides each state with federal funds for a health insurance program for vulnerable children.