The Supreme Court has accepted another challenge to the Obama administration’s initiative to require birth control coverage in employee health plans. Already, employers who object to providing birth control on religious grounds can claim an exemption, shifting the burden to insurers and the federal government. All they have to do is notify the government of their beliefs, generally by filling out a short form. But some groups say even that step violates their beliefs. The Supreme Court will consider several cases brought by groups including the Roman Catholic Archdiocese of Washington and the Little Sisters of the Poor, which runs homes for the elderly.