The failure of Democrats and Republicans to break the impasse over the “fiscal cliff” is raising the possibility of Congress going beyond the year-end deadline to complete the work necessary to avert steep tax hikes and budget cuts that experts fear could push the nation into another recession. A top Democrat in the House of Representatives said if the two sides agreed in principle on a deal but ran out of time to draft and pass the legislation implementing it, Congress could pass a temporary measure and work out the details in the following weeks. Representative Steny Hoyer of Maryland,...