As examples, a campaign senior official pointed to Wednesday's blistering speech by former New York City Mayor Rudy Giuliani and the harsh remarks made by GOP vice presidential nominee Sarah Palin, saying they could backfire on Republicans, The Hill, a Washington political newspaper, reported.
"I think they come at a political cost," Obama communications director Robert Gibbs told reporters Thursday.
Obama -- and in once instance his wife, Michelle -- has been attacked by speaker after speaker during the convention. However, Gibbs said he was struck by the comments by Palin and Giuliani, who both mocked Obama's work as a community organizer.
Giuliani, in particular, may have used too much sarcasm in his speech Wednesday, Gibbs said, which could "turn off voters who will decide this election."