Gallup Daily tracking data collected last Friday and Saturday show that last week's Republican National Convention had a only a slight impact on adults' likelihood of voting for Republican presidential nominee Mitt Romney. Forty percent of adults surveyed said they were more likely to vote for Romney based on what they had seen or read about the convention, while about as many (38 percent) said they were less likely to vote for him.

A similar divide could be found among independents, with 36 percent saying they were more likely to vote for Romney following the convention and 33 percent saying they were less likely to vote for him.

Meanwhile, Romney's convention speech was rated as excellent or good by 38 percent of Americans, according to Gallup's data. That's the lowest excellent/good rating of a GOP or Democratic nominee's convention address in the eight Gallup has tested since Bob Dole's Republican speech in 1996.