(CNN) - New polls released Thursday showed the battleground states of Colorado and Ohio remain statistically tied between President Barack Obama and Republican challenger Mitt Romney.
Likely voters in Ohio put Obama at 48% and Romney at 47%, and in Colorado, likely voters split 49% for Obama and 47% for Romney, according to the surveys by American Research Group. The sampling error of each survey was plus or minus 4 percentage points.
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In Colorado, the race was close across gender and age, as well as tied among independent voters. Independents went 48% to 45% for Obama over Romney. Younger voters and older voters were similarly divided between the two candidates. And among women, where other polls have shown Romney lagging behind Obama, ARG showed 50% went for the incumbent and 56% for the challenger.
In early August, Colorado was divided 45% for Obama and 50% for Romney, according to a poll conducted by Quinnipiac University for CBS News and the New York Times.
The Ohio survey showed deeper divides. Romney held a lead of 16 points among independents, and lagged 10 points behind Obama among women. Men leaned towards Romney but were divided along the sampling error.
A mid-August Quinnipiac survey in the Buckeye State also showed the Ohio race tied up.
Both Colorado, with 9 electoral votes, and Ohio, with 18 votes, are toss up states on the CNN Electoral Map. In 2008, Obama won Colorado by nine points and Ohio by five points.
The vice presidential candidates on both sides of the aisle campaigned on Wednesday in Ohio, and President Barack Obama stumped in Colorado on Thursday.