PP - This is not a good record and you are right to point it out.  There is a caveat to the most recent bill on the list LB 521 however, it does provide that women seeking or obtaining abortions cannot be prosecuted for having one without the presence of a physician.  What's interesting is what the Nation notes happened after 2011:

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In 2012, Mello voted with Planned Parenthood on two out of three bills tracked by the group—and was excused from voting on the third. After that, Mello, who had become the influential chair of the state legislature’s budget committee, voted with Planned Parenthood 100 percent of the time. By 2015, the group was celebrating a “fourth straight year…without enacting any new abortion restrictions in Nebraska, thanks largely to committed women’s health advocates engaged in the legislative process.”

Hunt, who spent much of the past week lobbying the legislature, is one such activist. Another is her friend Sofia Jawed-Wessel, who teaches sexual health at the University of Nebraska. Long before The Wall Street Journal made it an issue, Mello had asked Jawed-Wessel to speak at Thursday’s rally. “You know the slogan ‘Women’s rights are human rights’? Well, women’s rights are economic rights, too,” said Jawed-Wessel, to cheers from the crowd.

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Politico is reporting that "Planned Parenthood . . . declined to take aim at the DNC for aligning with Mello, even as it appeared to warn Democrats against embracing restrictions on women's health care."

So it certainly appears that Mello got religion - metaphorically speaking - and is now perceived as a pro-choice ally by abortion rights activists in Nebraska.  Even the Nation's Joan Walsh, hardly, a Sanders supporter, acknowledges Mello's "feisty economic populism."   Thus, Bernie's support for Mello seems eminently reasonable.  That said, as I conceded in a previous thread in response to a comment by RMRD, I think Bernie was wrong to dither when asked whether he supported Jon Ossoff.