UPDATE: Kid Rock has responded to the allegations in true Kid Rock fashion:
The group Common Cause has filed a complaint against singer and potential Michigan Senate candidate Kid Rock (née Robert Ritchie) saying that he has violated federal election law. Kid Rock has been teasing a Senate run to challenge incumbent Sen. Debbie Stabenow (D-MI) for quite some time now, but has not officially declared candidacy or filed any forms. He's also selling "Kid Rock for Senate" items. This, according to Common Cause, is illegal.
From the complaint, which asks the FEC and the DOJ to investigate Kid Rock:
“Regardless of whether Kid Rock says he’s only exploring candidacy, he’s selling ‘Kid Rock for Senate’ merchandise and is a candidate under the law. This is campaign finance law 101,” said Paul S. Ryan, Common Cause’s vice president for policy and litigation. “Given the activities we’ve documented in the complaint, he can’t reasonably claim to be merely testing the waters of candidacy and thus exempt from candidate filing requirements. He is a candidate and is obligated to abide by all the rules and make the same disclosures required of everyone else running for federal office.”
Common Cause is asking the FEC and DOJ to launch investigations of Kid Rock’s campaign and to “impose appropriate sanctions for any and all violations” along with “additional remedies as are necessary and appropriate to ensure compliance” with the Federal Election Campaign Act (FECA).
There's also this:
Bawitdaba da bang da bang diggy diggy diggy— Ben Kesling (@bkesling) September 1, 2017
Shirk the FEC said up jump the boogie
Bawitdaba da bang da bang diggy diggy diggy https://t.co/vPNRUOhqoF
While it's unclear if this complaint will actually result in anything happening, this complaint could possibly make Kid Rock actually make some moves on his "campaign."