WASHINGTON — Eric Cantor’s move on Tuesday to a boutique investment firm in New York drove home a new political landscape emerging on Capitol Hill as the Republican leadership reshuffles in the House: Wall Street and Big Business have lost their most sympathetic ear, oil and gas industries are on the rise, and Louisiana once again has a booming voice at the table.

Congress returns next week for a mere 12 scheduled legislative days before the November midterm elections, but in that brief reappearance, the House’s new leadership team will be tested. If nothing is done, the federal government will run out of money on Oct. 1, and the federal Export-Import Bank — which underwrites American private-sector exports — will exhaust its charter.

With both issues, the departure of Mr. Cantor, the former House majority leader defeated in a June Republican primary, and the rise of Representative Steve Scalise of Louisiana, the newest member of the Republican leadership, will be felt. Mr. Scalise, the new House majority whip, brings with him a capacity to deal with the House’s most ardent conservatives, which could help to keep the government open ahead of the elections.

But Mr. Cantor was the man who could translate the wishes of Big Business to the conservatives. Without him, the Export-Import Bank and its business supporters have lost their most persuasive advocate. Asked who in the new leadership can talk to business interests and Wall Street, Mr. Scalise said, “I have no idea.”