HONOLULU (CNN) - After delaying the start of his Hawaiian vacation because of the lame duck session of Congress, President Obama has decided to extend his trip by a day and will now head back to Washington on January 2, according to sources familiar with the schedule.

Obama was originally planning to leave Hawaii on New Year's Day, but since the start of his vacation was delayed by several days he has decided to tack an extra day onto the tail end of the trip.

The sources said the primary reason for the change was the president's desire to spend more time with first lady Michelle Obama and their two daughters.

The entire first family was originally supposed to depart for Hawaii last Saturday, but the president stayed back in Washington while everyone else stuck to the original schedule.

Staying behind in Washington was very fruitful for Obama. He was able to score major victories on the New START Treaty, repeal of the military's "don't ask, don't tell" policy, a food safety reform bill, and legislation providing health care to 9/11 responders, among other major priorities.