New Delhi, Sept. 24 -- From Texas to Ohio and Alaska to Iowa, campaigns are grappling with a fed-up electorate that is sour on the president and angry over soaring fuel prices driven by an unpopular war. While Republicans are flush with unprecedented cash that could move the needle in some races, overall the mood is glum heading into the election's final stretch as campaigns try to counter palpable Democratic enthusiasm to maintain their narrow lead in the House and Senate this November.

"Everybody is tired. You see the poll numbers. Everybody is cranky about gas prices," said Jeanette Hoffman, a Republican strategist from New Jersey. "The party in power is playing defense. This is a referendum on the incumbents."

Trump is trying to pro...