Whiteaker was elected to Congress in 1878, as Oregon's Representative-at large. The Democrats had been weakened in the House, and needed one vote to prevail in their nominee for Speaker of the House. The vote was needed by March 18, 1879. Whiteaker, all ready on his way to Washington, recieved word of this urgency while on a steamer between Portland and San Fransisco, California. Upon docking in San Francisco on March 12th, he was met by a railroad agent, and rushed to a special Central Pacific Railroad express train at Oakland. The regular transcontinental train was 25 hours out of Oakland, but Whiteaker's train managed to catch up with it. He arrived in Washington on the morning of March 18th, in enough time to be promptly seated by Congress and cast his vote.