Massachusetts State Senator Katherine Clark, who in May defended embattled Democratic Senate candidate Elizabeth Warren's claims of Native American ancestry on MSNBC, told one of her constituents today that she is retracting her support of those claims.

At a regularly scheduled constituent meeting Friday morning, Clark told her constituent, whose first name is Catherine and who has a Twitter account at @museofhistory:

I am telling you frankly that I thought there was a marriage certificate at the time. I was wrong.

The constituent said that Senator Clark seemed genuinely contrite, and told her "the [MSNBC] interview took an unexpected turn, and I wasn't prepared."

According to @museofhistory, the Senator approved of her sending out a tweet describing the conversation. This afternoon, she sent this tweet out:

@SenKClark told me today "I was wrong…I was incorrect about there being valid documentation" RE: Warren’s NA claimshttp://tinyurl.com/cdcp969 

In addition to @museofhistory, half a dozen other constituents were in attendance at the meeting. When it was over, Senator Clark posed for a photograph with @museofhistory.

Breitbart News has contacted Senator Clark's office for a follow up statement. Specifically, we want to know why it took Senator Clark three and a half months to publicly acknowledge her error.

Calls to the Elizabeth Warren campaign for comment were unreturned.