Via The Boston Globe, Scott Brown has launched his first ad regarding Elizabeth Warren’s claim to be Native American:

The 30-second spot, called “Who knows?” features television reporters talking about Warren “identifying herself as Native American to employers. …Something genealogists said they have zero evidence of.”

At the conclusion, a reporter asks Warren: “Is there anything else that’s going to come out about you that we don’t already know?”

The Democrat laughs in response. “You know, I don’t think so, but who knows.”

The ad comes after Brown, the Republican incumbent, has criticized Warren for taking a negative tone in the campaign. The ad bears some risk because Brown has built his popularity as a politician who is above destructive politics.

Although polls do not appear to show the controversy has had a defining effect on the race, the Brown campaign believes there are signs within surveys that show voters will be turned off to Warren if they learn more about the issue.

What do you think? It’s hard to get it all out in 30 seconds, there is so much wrong with her defenses.

But at least the issue is out there and not going away.