House Speaker Robert A. DeLeo said Tuesday that he will make no further compromises to save a bill to expand gambling in Massachusetts and is doubtful that the Legislature will return to override Governor Deval Patrick's rejection of the controversial measure. While DeLeo said he still plans to explore the possibility of calling legislators back into session to revive the bill, he said a deal this year was unlikely. The speaker's comments, together with the Senate president's pessimism Tuesday about reaching a resolution, give the strongest indication yet that the movement to bring casinos and perhaps slot machine parlors to the Bay State, despite progressing further than it ever has, will again fall short. 'I like to keep out hope, but at this point, I can't say I'm optimistic,' DeLeo said in an interview with Globe reporters. Senate President Therese Murray said separately Tuesday, 'I don't see how it can be salvaged,' State House News Service reported. 'We've exhausted our possibilities of keeping it alive.' DeLeo, sitting in a paisley arm chair in his State House office, bristled when asked whether he should compromise further, specifically, whether he should ease up on his insistence that slot machines at racetracks be part of any final agreement. The governor, a long-time opponent of slot machines, agreed last week to approve one slot facility that would be competitively bid, but lawmakers passed a bill calling for two slot parlors at race tracks, which Patrick rejected. The governor sent back an amended bill that would license only three resort-style casinos, the one major point of agreement among him, the House, and the Senate. DeLeo, whose once close relationship with Patrick has frayed during their bitter split over gambling, asserted that the governor had not been as willing to compromise as he had. 'I think I've been the biggest compromiser in the building,' said DeLeo, who originally wanted more slot parlors. 'Asking me to go further than that is truly unreasonable.' In private meetings with legislative leaders, the speaker had heatedly defended racetrack workers against opponents of slot machines. But in the interview Tuesday, DeLeo was mild in his criticism of the governor, saying merely that he was disappointed with Patrick's unwillingness to accept slots at the tracks. 'He's known for two years this is a priority of mine,' said DeLeo, the son of a track worker. 'I think he should move one more ((step toward compromising)). I've moved. ... It comes to the point where you have to stand for your principles and do what's right.' But DeLeo signaled during the interview that the standoff has soured his relationship with Patrick. For example, DeLeo indicated that he has little interest in getting involved in the governor's reelection campaign. He pointed out that he has endorsed Patrick and said he would continue to support him. But asked if he would take Patrick around his legislative district to campaign for him if asked, DeLeo, a Winthrop Democrat, said, 'I think he and I would have to talk about that.' The two leaders largely hid their cold feelings at an upbeat event Tuesday at Fenway Park, where Patrick signed a bill to extend insurance coverage to children and adults with autism. Patrick sought to disarm the situation by effusively praising DeLeo and Timothy P. Murray, telling the crowd of hundreds that this legislative session has been 'one of the most productive ... in decades, in decades.' Afterward, DeLeo seemed to soften his rhetoric, making it a point to say that despite the dust-up over gambling the Legislature and Patrick together accomplished a great deal this session. For the gambling bill to survive, the House and Senate would each have to muster a two-thirds majority to override Patrick. In the interview, DeLeo offered a glimpse of his passion for providing the state's racetracks the chance to have slot machines, describing his deep ties to the neighborhoods and communities where track workers and their families live. His father was a maitre d' at Suffolk Downs for many years, and the speaker spent time at the track as a child. Just Tuesday, with hope for a deal dimming, Plainridge Race Course in Plainville announced it was laying off 157 workers and contractors, which it said was about one-tenth of its workforce. 'The fact of the matter is that these jobs provide a living for a whole lot of people,' DeLeo said. 'I just can't turn my back on them for the sake of compromise.' Somewhat wistfully, DeLeo described the encounters he has had with constituents in Revere and Winthrop, where many families depend on the jobs provided by two tracks, Wonderland Greyhound Park and Suffolk Downs. 'Yeah,' he said. 'That's what makes me tick.' 