A casino-financed group seeking to defeat November's ballot question to repeal the state's gambling law is ramping up its campaign spending.

The Coalition to Protect Massachusetts Jobs spent $702,000 from Sept. 1 through 15, according to the group's most recent campaign finance filing. That's up from the $577,074 it spent in the two-months from its July formation to the end of August.

The political advocacy group is financed largely by Penn National Gaming, which won state's lone slot parlor license and is building a $225 million development at the harness racing track in Plainville. MGM Resorts International, which won a resort casino license for its $800 million development in Springfield, has also been a major donor.

Repeal the Casino Deal, the anti-casino group, meanwhile, spent $50,000 during the same period.