There's nothing Gov. Mark Dayton can do to stop a voter ID constitutional amendment from appearing on the November ballot.

But he's issued a symbolic veto of the legislation that created the ballot amendment anyway.

"Although I do not have the power to prevent this unwise and unnecessary constitutional amendment from appearing on the Minnesota ballot...the Legislature has sent it to me in the form of a bill," Dayton told reporters at a Monday press conference. "Thus, I am exercising my legal responsibility to either sign or veto the amendment...I am vetoing."

The governor made a similar symbolic veto of last year's ballot proposal that would amend the Minnestoa constitution to ban gay marriage. Both amendments will be on the general election ballot, and Datyton said he would do "everything in my power" to encourage voters to vote both of them down.

The idea of requiring voters to prove that they are who they say they are has been consistently popular in the polls. So popular, that Dayton accused the House and Senate GOP leadership of passing "whatever polls well," this session.