Not that Carney is interested in attaching any national significance to his race. "I'll support (President Barack Obama) when I think he's right and I won't when I think he proposes something that isn't in the best interests of Delaware," he says.
But with House Republicans on offense in dozens of races in all regions of the country, victories by Carney and a few others challenging for GOP-held seats — most prominently in Louisiana, Hawaii and Illinois — could amount to a last line of defense for Democrats in their struggle to maintain a majority.
After picking up 55 seats combined in the last two elections, "there was less territory to move into. But we were determined to maximize whatever opportunities there were on offense," said Rep. Chris Van Hollen, D-Md., chairman of the House campaign committee.
"That was something that did not happen in 1994," he added, referring to the last time the Republicans won control of the House.
Republicans must gain 40 seats this fall to capture the House majority, and a struggling economy coupled with strong voter dissatisfaction gives them numerous targets to achieve their goal.
They don't dispute that a few of their own are at risk but say the national trend is moving inexorably their way.
"By October the Democrats are going to realize they have more defensive places" than now appears, and less money to go after GOP-held seats, predicted Guy Harrison, executive director of the National Republican Congressional Committee.
In Delaware, Harrison said, the party-preferred contender, Michele Rollins, "has a very good shot in what frankly for us is a tough state to run in." The primary is Sept. 14.
To understand why Carney, 54, has a chance to take away a GOP-held seat is also to understand why there are so few races like his.
Most important was the decision by nine-term Republican Rep. Mike Castle to give up his seat and run for the Senate, although other factors are working in the Democrat's favor.
Unemployment in the state was 8.4 percent in July, a full percentage point below the national average, and has declined each month since March. As Vice President Joe Biden's home state, Delaware is also on a dwindling list of those where polls show a plurality views Obama favorably rather than unfavorably.
Democrats enjoy a huge advantage in voter registration in the state, which has only one congressional district. Forty-seven percent are Democrats, 29 percent Republicans and 23 independent.
Nor is there significant evidence yet that political experience — which has proved toxic in other states — is viewed negatively by large portions of the Delaware electorate. A two-time lieutenant governor who lost a gubernatorial primary in 2008, Carney is regarded as the favorite against either Rollins or her primary rival, businessman Glen Urquhart.
Additionally, "the Republican primary is working to his advantage" by pushing the contenders to the right, said Gov. Jack Markell, a Democrat who outpolled Carney in a primary two years ago.
Among the other top Democratic target seats, Republican Reps. Joseph Cao in Louisiana and Charles Djou in Hawaii hold office in areas that generally favor Democrats overwhelmingly. In Illinois, the party hopes to win the seat Rep. Mark Kirk is giving up to run for the Senate.
Rollins, a 65-year-old wealthy Delaware businesswoman, is a first-time candidate who is backed by the GOP establishment and runs ahead of Urquhart in private polls. In an interview, she said she decided to run as a reaction to Obama's health care bill, which she opposes, and says, "For me, this election is very much about the free enterprise system. ... Jobs are the issue, the economy is the issue. Who ever heard of hundreds of trillions of dollars in debt?"