Why Common Core Must Be Opposed

http://www.youtube.com/watch?v=jp_mp5cJMDU
 The Common Core educational initiative, according to its official website, strives to provide "a set of high-quality academic standards in mathematics and English language arts/literacy." Its critics, however, see it very differently. This opposition, led by professors of education, mathematicians, former members of the Department of Education, the largest teachers' union in the country, and countless other professionals, is seeking to derail this educational agenda before it can fully take over schools across the United States.

Why are these groups opposed to Common Core, and what is Common Core's real purpose?