他曾于2003年至2012年担任[[密歇根州]]第十一国会选区[[美国众议院|联邦众议员]]。2011年7月2日至2011年9月22日，他参加了2012年美国总统选举的[[2012年撒迪厄斯·麦科特尔竞选美国总统|竞选]]。在放弃参选总统后，他决定在自己所属国会选区竞选连任，但由于大部分支持者的请愿存在欺诈，他未能获得选区内共和党初选的入围资格<ref>{{cite web | archivedate = 2015-01-02 | deadurl = no | archiveurl = https://web.archive.org/web/20150102002224/http://detroit.cbslocal.com/2012/05/29/mccotter-campaign-investigated-for-election-fraud/ | url = http://detroit.cbslocal.com/2012/05/29/mccotter-campaign-investigated-for-election-fraud/ | title = McCotter Campaign Investigated For Election Fraud | date = 2012-05-29 | publisher = WWJ-TV | accessdate = 2015-03-01}}</ref><ref name=DFPEnds>{{cite news|url=http://www.freep.com/article/20120602/NEWS15/120602023/Thaddeus-McCotter-re-election-congress|title=McCotter ends write-in campaign for re-election|first1=Todd|last1=Spangler|first2=Kathleen|last2=Gray|first3=Bill|last3=Laitner|newspaper=[[Detroit Free-Press]]|date=2012-06-02|accessdate=2012-06-02}}</ref><ref>{{cite web|last=Lange |first=Amy |title=AG announces charges against 4 after McCotter petition mess |url=http://www.myfoxdetroit.com/story/19234130/2012/08/09/ag-announces-charges-against-4-after-mccotter-petition-mess? |publisher=WJBK Fox 2 |accessdate=2012-08-17 |deadurl=yes |archiveurl=https://web.archive.org/web/20120814043318/http://www.myfoxdetroit.com/story/19234130/2012/08/09/ag-announces-charges-against-4-after-mccotter-petition-mess |archivedate=2012-08-14 }}</ref>。2012年7月6日，他辞去了自己的职务。<ref name="FaceBookResignation"/>

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