Because it's a clever piece of PR by Rick Perry as the 2-minute podcast starts out with the doom and gloom of Obama's administration ( zero new jobs created in August ) and finishing with Perry on a horse riding to the rescue.A euphemism for Perry being the only candidate to rescue the US from the current malaise the nation is in.
He doesn't want to tell everyone about his own liberal policies. He hasn't done anything spectacular so he can't talk about his accompishments so he can only attack. The right wingers have dropped Perry already so he really is yesterday's news.