Nov. 2 (Bloomberg) -- Barack Obama has an average lead of 6.4 percentage points over John McCain in national polls with two days left in the presidential campaign.
Polls released in the last week showed the Democratic candidate with leads ranging from three points in a Fox News survey to 13 points in a CBS News poll. The average of polls compiled by Real Clear Politics shows that Obama has been ahead between five and eight points since the beginning of October.
``Obama's is a campaign about gaining a lead and then holding it,'' said Julian Zelizer, a professor of history and public affairs at Princeton University in New Jersey. ``McCain's last two weeks have not changed this. Most important, the context of the election has remained the same -- an economy in crisis -- so it is hard to get those numbers to move.''
After pulling ahead of Obama in some polls following the Republican National Convention in the first week of September, McCain's support slid as the financial crisis deepened, with voters considering Obama better able to manage the economy.
That trend has been reflected in the so-called battleground states where the presidential election will be decided.
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