To be tax-exempt under section 501(c)(3) of the Internal Revenue Code, an organization must be organized and operated exclusively for exempt purposes set forth in section 501(c)(3), and none of its earnings may inure to any private shareholder or individual. In addition, it may not be an action organization, i.e., it may not attempt to influence legislation as a substantial part of its activities and it may not participate in any campaign activity for or against political candidates.
Exemption Requirements - Section 501(c)(3) Organizations
They support and defend Obama at every turn, as we see here,
Facts Puncture The Myth That Obama "Apologies" Have Ruined U.S. Standing | Media Matters for America
They also attempt to influence legislation, as with these two articles.
Conservative Media Still Deny Fact That Unemployment Benefits Stimulate The Economy | Media Matters for America
How The Right Redefines "Fairness" To Push Tax Hikes On Poor People | Media Matters for America
Those are partisan political positions and are a violation of the IRS code that posted above.
I hope you are wearing your back-brace. You're going to move the goal post and brother, it's heavy. Be sure and lift with your legs.