Obama, the Democratic senator from Illinois, has scheduled stops in Tampa, Fla., and Indianapolis, while his Republican challenger from Arizona is to visit Bethlehem, Pa.

The candidates' second debate Tuesday at Belmont University in Nashville was subdued, even when they traded barbs and chided one another about their positions on the economy, taxes and foreign relations, a New York Times analysis reported Wednesday.

During the debate, the candidates communicated frustration more often than anger, the analysis said, with voices and gestures muted. The attacks and counterattacks the candidates leveled about the other's character in recent days were not mentioned.

The third presidential debate will be Oct. 15 at New York's Hofstra University.