WAUWATOSA, Wis. -- A violent brawl broke out on Tuesday during a discussion in a Wauwatosa restaurant over the proposed same-sex marriage referendum, and the incident was apparently caught on videotape.

The patrons' discussion at George Webb's restaurant allegedly focused on the proposal to add an amendment to the state constitution to explicitly prohibit gay marriage, and apparently became heated, WISC-TV reported.

In the video, a man in a suit can be seen pushing one person down and punching another customer. The man walks out and then comes back, apparently throwing ketchup bottles and other objects.

One person who was injured, Michael Lopez, needed five stitches. Lopez said that the incident could be construed as a hate crime, WISC-TV reported.

"That's what it was," Lopez said. "It was a very hateful circumstance. Obviously, the guy had a problem with gay issues, gay marriage."

Police said that they haven't arrested anyone in connection with this incident. They said that they are trying to make a positive identification from the videotape.

Another Debate Held In Green Bay

A formal debate was held in Green Bay on Tuesday night, but didn't have the violent results. Instead, the pros and cons of amendment was weighed by the proposal's opponents and proponents.

Those against the amendment said it would have ramifications for gay and unmarried straight couples because it wouldn't recognize any civil union similar to marriage.

The other side said that the institution of marriage is at risk of being redefined by an activist judge.

The event was held at Northeast Wisconsin Technical College.

The voters will have the final say on the amendment during the Nov. 7 election.