CHARLOTTE, N.C. — A dismal new snapshot of jobs in America shadowed the presidential campaign on Friday, testing the voter patience that will save or sink President Barack Obama’s re-election bid. Seizing on the timing, Republican Mitt Romney said Obama’s convention party had given way to quite a “hangover.”

Employers added just 96,000 jobs in August, not nearly enough to seriously dent unemployment, let alone inspire confidence that the economy is getting better. Even the good news — the unemployment rate dropped from 8.3 percent to 8.1 percent — resulted from many job-hunters just giving up.

“We’re going in the wrong direction,” Romney declared, a view echoed by a majority of Americans still reeling from a massive recession.

Obama put the emphasis on a trend showing employers have added jobs for 30 months in a row now. He did so with a nod to public frustration.

“We know it’s not good enough,” Obama said, dealing with the downbeat news mere hours after his confetti-flying Democratic National Convention. “We need to create more jobs, faster.”

With 60 frenetic days left until the election, the economic report was not grim enough to alter the political narrative of a consistently tight race. Yet the attention it commanded eroded any hope of a post-convention boost for Obama.

Instead, it underlined his point that economic recovery will not be “quick or easy.” No president has won re-election with unemployment over 8 percent since Franklin D. Roosevelt, and Obama has embraced that Great Depression comparison, hoping to show why he and the nation need more time.

Their conventions behind them and their debates just ahead, Obama and Romney sprinted into the next phase of campaign, targeting eight or so toss-up states. The two men headed the same way Friday, appearing in Iowa and New Hampshire, two states with small but potentially decisive electoral prizes.

The economy has added just 139,000 jobs a month this year, a slower pace than last year. It takes roughly 200,000 jobs a month to shrink unemployment. In perspective, the economy was bleeding hundreds of thousands of jobs when Obama took office, but that does not comfort the jobless today.

The new results only sharpened the competing and defining storylines of the election. Romney says the poor pace of job growth demands that Obama be thrown out of office, while the incumbent implores voters to compare the candidates’ economic visions and see why only his would help the middle class.

If the jobs numbers did hang over Obama, he did not show it before the cameras.

On the first stop after his convention in Charlotte, N.C., the president bounded up a path toward a rally in New Hampshire, smiling and waving.