Party officials and the candidates themselves acknowledge that they still have uphill fights in both the primaries and the general elections, but they say that black Republicans are running with a confidence they have never had before. They credit the marriage of two factors: dissatisfaction with the Obama administration, and the proof, as provided by Mr. Obama, that blacks can get elected.

Image Allen West, running in Florida, says the notion of racism in the Tea Party movement has been made up by the news media. Credit... Barbara P. Fernandez for The New York Times

“I ran in 2008 and raised half a million dollars, and the state party didn’t support me and the national party didn’t support me,” said Allen West, who is running for Congress in Florida and is one of roughly five black candidates the party believes could win. “But we came back and we’re running and things are looking great.”

But interviews with many of the candidates suggest that they felt empowered by Mr. Obama’s election, that it made them realize that what had once seemed impossible — for a black candidate to win election with substantial white support — was not.

“There is no denying that one of the things that came out of the election of Obama was that you have a lot of African-Americans running in both parties now,” said Vernon Parker, who is running for an open seat in Arizona’s Third District. His competition in the Aug. 24 primary includes the son of former Vice President Dan Quayle, Ben Quayle.

Princella Smith, who is running for an open seat in Arkansas, said she viewed the president’s victory through both the lens of history and partisan politics. “Aside from the fact that I disagree fundamentally with all his views, I am proud of my nation for proving that we have the ability to do something like that,” Ms. Smith said.