The officers to be elected at the first general election shall include two senators and one representative to serve in the Congress of the United States, unless senators and a representative have been previously elected and seated. One senator shall be elected for the long term and one senator for the short term, each term to expire on the third day of January in an odd-numbered year to be determined by authority of the United States. The term of the representative shall expire on the third day of January in the odd-numbered year immediately following his assuming office. If the first representative is elected in an even-numbered year to take office in that year, a representative shall be elected at the same time to fill the full term commencing on the third day of January of the following year, and the same person may be elected for both terms.