The votes followed the money on constitutional questions in Minnesota last year, according to campaign finance reports made public on Friday.
The two groups opposing the marriage and the voter ID amendments spent about $15.6 million. The two main groups supporting the amendments spent just over $7 million.
Minnesotans, contrary to some early expectations, voted down both amendments in November.
The nearly $23 million spent on the constitutional questions is only part of the huge amounts of cash tossed at Minnesotans to influence their votes last year. The political parties added $24 million and outside groups spent at least $8 million more, creating what is likely the most expensive state-level contests Minnesota has seen.
The raising and spending was as lopsided as the results, which saw Minnesota voters not only vote against the two amendments but also swap a Republican-controlled Legislature for a DFL-controlled one.
Throughout last year, Minnesotans United for All Families, the main group that campaigned against the amendment to constitutionally ban gay marriage, brought in far more cash than Minnesota for Marriage, the main group campaigning for it.
"We were badly outspent," said Frank Schubert, a California-based consultant and Minnesota for Marriage campaign manager.
Minnesotans United spent more than $12 million. Now, it is moving to lobby the Legislature to legalize same-sex marriage. The group has registered seven lobbyists to make that happen, although backers admit they currently lack the votes to pass a same-sex marriage bill.