How exactly did he do that?

http://www.thepoliticalinsider.com/what-barack-obama-just-asked-police-to-do-is-outrageous-video/
http://www.youngcons.com/fed-up-police-officers-say-they-might-turn-their-backs-on-obama-at-d-c-memorial-service/
http://madamenoire.com/536961/baltimore-police-union-says-officers-are-scared-to-do-their-job/

I am sure that you can find just as many left leaning links that ay the opposite. We will just have to agree to disagree on this one :)