There are several efforts going on, at the present. The highest profile being, the one promoted by

Sean Stone, son of the famous film director Oliver Stone, in coordination with Infowars:

http://www.thewaronevil.com/

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and the one one by Sheriff Joe: http://www.youtube.com/watch?feature=iv&src_vid=F1wiGDYPALI&annotation_id=annotation_284140&v=6Qm7Idz3OY8

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But, there are others: http://www.impeachobamacampaign.com/

http://townhall.com/columnists/tonykatz/2012/04/04/obama_is_making_the_case_for_his_own_impeachment

http://www.google.com/webhp?hl=en&tab=nw#hl=en&sugexp=frgbld&gs_nf=1&cp=13&gs_id=i&xhr=t&q=Impeach+Obama&pf=p&output=search&sclient=psy-ab&oq=Impeach+Obama&aq=0&aqi=g4&aql=&gs_l=&pbx=1&bav=on.2,or.r_gc.r_pw.r_qf.,cf.osb&fp=6791f0a8b4f506c2&biw=800&bih=437

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So, pick one and join in. It's your duty!