A report released Thursday said with reported spending between $13 million and $18.9 million, Michigan easily outspent the rest of the country in the 2012 Supreme Court election.
The report, written by Justice at Stake, the Brennan Center for Justice at New York University School of Law, and the National Institute on Money in State Politics, said in states where courts remained ideologically divided, such as Michigan's 5-2 conservative majority, there was more spending.
The report also said 12 states spent greater than $1 million on their Supreme Court elections.
In Michigan, political parties did most of the spending, and most of the money went to television advertisements. The Democratic party spent an estimated $4.8 million to $6.8 million and the Republican party spent an estimated $3.5 million to $7 million.
Both parties spent more than the six high court candidates combined, which was $3.4 million.
The report also showed a majority of the cash spent was never disclosed in campaign finance filings due to the state's narrow definition of what is a campaign contribution.