200809292128 | Poll puts Obama in the lead for the US Presidential race.

Poll puts Obama in the lead for the US Presidential race.

Washington - Just five weeks from election day, Democrat Barack Obama is making ground in battleground states and slowly tilting the US political map in his direction, new polling data shows.

But John McCain is strong in strategic states like Ohio and Pennsylvania that can offer a plausible path to the 270 electoral votes needed for the White House if combined with Republican bastions and a few swing states.

New polls over the last week and electoral projections by news organisations suggest Obama may be accelerating as the financial meltdown bites.

The latest electoral map by independent RealClearPolitics.com has 228 electoral votes solid or leaning towards Obama, with 163 leaning or solid for McCain, with 147 others a toss up.

Ohio is the bellwether

CNN's latest map awards 240 electoral votes to Obama and 200 to McCain with 98 up for grabs.

But McCain appears to be running strong in Ohio (20 electoral votes), often the bellwether for presidential hopes, and is pressuring Obama in neighbouring Pennsylvania (21 electoral votes).

And he seems to have thwarted Obama's hope to put up a fight in some solid Republican ground, as several states like Montana and North Dakota seem now headed solidly into his column.

Battle is being waged as far northeast as New Hampshire (four electoral votes), in the industrial Midwest, and Nevada (five votes) and Colorado in the west (nine votes).

Obama campaign manager David Plouffe on Saturday predicted the Democrat would get a boost in the limited number of key swing states which can go Republican or Democratic by his showing in last Friday night's debate.

"We like where we are in these battleground states," he said.

"We think states like Virginia, Colorado, Florida, Ohio, North Carolina, Indiana, Missouri, to name a few, have really become stronger for us in the last couple of weeks."

Obama looking strong

Many experts believe that the election, like it did in 2004, could come down to Ohio.

"I think it will be the state of Ohio that obviously determines who the next president of the United States is," McCain said in the state Tuesday.

"The last person who succeeded in becoming president of the United States without the state of Ohio was Jack Kennedy and that has been a long time," he said, referring to the 1960 election.

McCain is appealing to conservative Democrats not yet sold on Obama for either racial or political reasons. His running mate Sarah Palin could also help among cultural conservatives.

The RealClearPolitics average has the Democrat up nearly seven points on an Obama spurt in the last two weeks, after the race came within a couple of points in August, before the economic crisis hit.

Quinnipiac University last week had Obama up by 48 to 44 percent in the state.