A new CNN/ORC poll shows the presidential race tied at 48%.
Just before the GOP convention last week a similar poll showed President Obama ahead by two points, 49% to 47%.
Said pollster Keating Holland: "The Republican convention had at best a mild effect on the presidential race, and from a statistical viewpoint, no effect at all. Demographically, Romney's overall one-point bounce masks some movement among subgroups and suggests that Romney's pitch to some groups may have worked but at the expense of turning off another group of voters."