Yes/No. If either Barack Obama or Bill Richardson is on the Democratic ticket, one would expect higher African American or Hispanic turnout than usual. Also Hillary Clinton would definitely get more votes from women, even if no higher percentage of women turnout.
Which would bode well.
Think about this. The swing from women to the Republicans in 04 was one of Kerry's biggest weaknesses. A 4% swing away from you, from your single biggest voting bloc is deadly. If whoever the democrat is can bring back those women who voted Gore but not Kerry. OK - women constituted 54% of voters in 2004 and roughly the same in 2000 - Gore got 55% of their votes, Kerry, only 51%. If the voter numbers increase in 2004, and that proportion remains the same - the Democrat should be able to expect a increase of about 1.3-5 million votes alone.