Former Vice President Joe Biden continues to top the 2020 Democratic primary field, earning 31 percent support in an NBC News/Wall Street Journal poll released Tuesday. He's gained five percent from the outlets' July poll. Sen. Elizabeth Warren (D-Mass.) meanwhile gained six percent from July, coming in at 25 percent. The top contenders' gains seem to have come from Sen. Kamala Harris (D-Calif.), who hit 13 percent in July but is down to 5 percent now. Biden proved the top choice of nearly half of the poll's black respondents and, likewise, almost half of those over age 65. But all that could change, seeing as only 9 percent of respondents said they were definitely decided on which candidate they'd support.

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