A new poll from Rasmussen shows a dead heat in the Massachusetts Senate race between incumbent Republican Scott Brown and his Democratic challenger, Harvard law professor Elizabeth Warren. Both candidates are tied at 45 percent. Here's more from Rasmussen:

The race is little changed from a month ago, when Warren was just one point ahead of Brown, 46% to 45%. Brown was leading Warren by five in late February.

Warren, who one geneoolgist says may be 1/32nd Cherokee Indian, has been criticized for describing herself as Native American, and Harvard University until recently had listed her as a minority professor in response to questions about the diversity of its staff. Critics have questioned whether Warren took advantage of affirmative action programs to further her academic career, a charge which she denies. Brown has said only that Warren should fully answer the questions raised by the controversy.

While just 49% of Massachusetts voters say they are following news of Warren’s Native American heritage at least somewhat closely, voters regard her as less ethical than her GOP opponent. Fifty-six percent (56%) of Massachusetts voters view Warren as at least as ethical as most other politicians, but 23% consider her less ethical. Another 21% are not sure. By comparison, 74% regard Brown as at least as ethical as most other politicians. Only eight percent (8%) think he's less ethical. Seventeen percent (17%) are undecided.

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