For the second time in four months, Revere voters have said yes to a casino at Suffolk Downs, approving a $1.3 billion Mohegan Sun proposal at a referendum today, according to city officials.
The vote keeps the project alive in the race for the Greater Boston resort casino license, offering a second chance for Mohegan Sun to win a casino license after the company lost a referendum in Palmer in November.
The vote offers a second chance, too, for Suffolk Downs, the thoroughbred racetrack that straddles the Revere-East Boston city line. The track, an early favorite to win the Greater Boston resort casino license, lost a referendum last November in East Boston, which killed an earlier casino proposal at the track.
Mohegan Sun will compete with an Everett proposal from Wynn Resorts for the coveted license, which will be awarded in May or June.
Unofficial returns showed more than 63 percent of the people who voted backing the casino.
Mitchell Etess, chief executive of the Mohegan Sun Tribal Gaming Authority, told supporters at Suffolk Downs that he expected to win the license.
‘‘We’re going to win this license because our application to Massachusetts is unconditional,’’ Etess said. ‘‘We are ready to go.’’
The Associated Press contributed to this article.