Supporters of a ballot measure to eliminate teacher tenure and base employment of student achievement delivered boxes of signatures to the Secretary of State's office in Jefferson City, Mo., Sunday May 4, 2014. Marc Ellinger, an attorney for Teach Great who is backing the initiative, said more than 275,000 signatures were turned in to put the constitutional amendment on the November ballot. Election officials have until August to verify the signatures to make ensure the measure qualifies for the ballot. (AP Photo/Jordan Shapiro)
Supporters of a ballot measure to eliminate teacher tenure and base employment of student achievement delivered boxes of signatures to the Secretary of State's office in Jefferson City, Mo., Sunday May 4, 2014. Marc Ellinger, an attorney for Teach Great who is backing the initiative, said more than 275,000 signatures were turned in to put the constitutional amendment on the November ballot. Election officials have until August to verify the signatures to make ensure the measure qualifies for the ballot. (AP Photo/Jordan Shapiro)
Supporters of a ballot measure to eliminate teacher tenure and base employment of student achievement delivered boxes of signatures to the Secretary of State's office in Jefferson City, Mo., Sunday May 4, 2014. Marc Ellinger, an attorney for Teach Great who is backing the initiative, said more than 275,000 signatures were turned in to put the constitutional amendment on the November ballot. Election officials have until August to verify the signatures to make ensure the measure qualifies for the ballot. (AP Photo/Jordan Shapiro)