Most major polls have U.S. Sen. Barack Obama, D-Illinois, leading U.S. Sen. John McCain, R-Arizona, in the contest for U.S. president. And, if the election were held today, instead of on Tuesday, November 4, Election Day, Obama would register a decisive victory in the all-important electoral college, as well as in the popular vote.
As of late Friday, NPR.org's survey of polls had the electoral vote at Obama, 291, McCain 163. Four battleground states are still in play: Ohio, where Obama lead by 5%; Florida, Obama by 3.5%; Indiana, McCain by 1.7%; and Missouri, McCain by about 0.5%. Concerning the national vote, on Friday, Gallup.com's daily tracking poll had Obama leading McCain, 52% to 41%.
Still, as most political aides will tell you, "the only poll that really counts is the one on Election Day, Tuesday, November 4." In other words, polls can err; that's why they have a margin of error, typically +/- 2%.
Polls only recently have become more accurate. Some notable poll mistakes include the 1980 U.S. presidential election, when some polls had incumbent President Jimmy Carter, a Democrat slightly ahead of the challenger, then Gov. Ronald Reagan, a Republican. Reagan, of course won the 1980 election in a landslide.
Pres. Truman had the last laugh on pollers
But the biggest polling error in a presidential election has to be the 1948 election between President Harry S. Truman, a Democrat, and challenger Gov. Thomas E. Dewey, a Republican.
The polls predicted that Dewey would win by a large margin. They were wrong: Truman won a decisive victory, 303-189, in the electoral college.

Although it may seem like it's been going on for a long time, the sprint called the U.S. presidential campaign has just started.
As voters prepare for the Super Tuesday primaries, Democrat Barack Obama is closing the gap with Hillary Clinton while GOP front-runner John McCain is surging ahead of Mitt Romney.







