Washington: President Barack Obama has in a video message wished a Happy Diwali and “Saal Mubarak” to all those who celebrate the festival of lights saying it was a reminder that light will ultimately prevail. Obama, who in 2009 became the first US president to celebrate Diwali at the White House, recalled the “wonderful time” he and his wife Michelle had celebrating the festival in Mumbai during his 2010 visit to India.