A new CNN/Time poll shows that John McCainJohn Sidney McCain The 13 Republicans needed to pass gun-control legislation Biden's debate performance renews questions of health At debate, Warren and Buttigieg tap idealism of Obama, FDR MORE's recent surge in national polls may also be carrying over in key swing states.

The poll, conducted by Opinion Research, shows tight races in Missouri, New Hampshire, Virginia and Michigan.

Obama holds a 4 percent lead in Michigan and a 6 percent edge in New Hampshire, but trails behind the Arizona senator in Virginia by 4 percent and Missouri by 5 percentage points.

When third party candidates Bob Barr, Cynthia McKinney and Ralph Nader were factored in, the numbers changed within a 3-5 percent range, but Obama remained ahead in New Hampshire and Michigan and McCain in Virginia and Missouri.

The poll is based entirely off interviews conducted following the Republican Convention.

The numbers run counter the argument made by Obama campaign manager David Plouffe, who told reporters Tuesday to "stop hyperventilating" over national numbers and to focus on key swing states where "we feel very good about where we are."

- Katie Stapleton-Paff