Barack Obama leads John McCain in five of eight crucial battleground states one week before the presidential election, with McCain ahead in two states and Florida dead even, according to a series of Reuters/Zogby polls released on Monday.
Obama held steady with a 5-point lead over McCain among likely U.S. voters in a separate Reuters/C-SPAN/Zogby national tracking poll, the same advantage he held on Sunday. The national telephone poll has a margin of error of 2.9 percentage points.
Republican McCain is struggling to defend about a dozen states won by President George W. Bush in 2004, including all eight of the states surveyed over the last three days.
Breakthroughs by Obama in any of those states could move him close to or above the 270 electoral votes he needs to win the White House on November 4.
Obama, a Democratic senator from Illinois, held narrow leads over McCain in Virginia, North Carolina, Missouri, Ohio and Nevada, most within the margin of error of 4.1 percentage points. McCain had a solid 10-point lead in West Virginia and a 6-point edge in Indiana.
The two candidates were tied at 47 percent in Florida, the largest of the battlegrounds with 27 electoral votes and the state that decided the disputed 2000 election.
Most polls show Obama comfortably ahead in all of the states won by Democrat John Kerry in 2004, but the Reuters/Zogby polls show McCain in serious danger in several states won by Bush.
"If Obama holds the Kerry states, he is in line now to get enough electoral votes to win the White House," Zogby said, noting McCain faces a difficult fight in a handful of states where Republicans have a long history of success.