ST. PAUL, Minn. (AP) — New Minnesota campaign finance reports show that spending on the fight over an unsuccessful constitutional amendment to ban gay marriage topped $18 million last year

The spending made it Minnesota’s most costly election contest of 2012. But it was just a slice of the tens of millions in political dollars spent on races up and down the ballot.

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Minnesotans United for All Families, the group that led the campaign to defeat the marriage amendment, spent about $12.4 million last year. It was far more than the $5.6 million that Minnesota for Marriage put into its failed effort.

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There was also a multimillion dollar campaign surrounding the other constitutional amendment that voters turned back. That one would have required people to present photo IDs to vote.

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