More democrats voted for Bush than did Republicans for Gore. This can probably be partly explained by Nader receiving his largest support from independents. Those who voted for Bush made up their minds more than one month before the election, while those who voted for Gore and Nader made up their minds within the last month. Protestants voted for Bush, while Gore won everything else, including Catholics. But the reason for the Catholics going for Gore might be explained by the fact that minority Catholics overwhelmingly supported Gore, but white Catholics actually still went with Bush.
Abortion is still an important issue.
Nader faired better among those with no college education than those with a college education. If there was only a two-way race between Gore and Bush, Bush would win the popular vote.