With just over a week to go until Election Day, the latest poll shows an even tighter race in one key battleground state. A new CNN/ORC International survey shows President Obama with a four-point edge over Mitt Romney in the race for Ohio's 18-electoral votes. 50% of likely voters questioned in the poll say they're backing the president. 46% say they're supporting the former Massachusetts governor . Obama's four point advantage is within the survey's sampling error. Polling of Ohio voters last month, before the first debate, showed Obama ahead of Romney by 7 to 10 points.