Jesse Jackson and George Bush found themselves in an unlikely political alliance Saturday as both attacked Democratic presidential front-runner Michael Dukakis, with Jackson saying he's too conservative and Bush saying he's not tough enough.

Dukakis, meanwhile, spent the day pleading with supporters in Ohio and Indiana to avoid the overconfidence that may come from his wide lead over Jackson for the Democratic presidential nomination."I want to ask you once again to do everything you can, on those phone banks, in your neighborhoods, with your friends and co-workers, to make sure the people are taking this primary seriously, that they know it is important," Dukakis said in Cincinnati.

Dukakis is heavily favored to win Tuesday's primaries in Ohio and Indiana and has built up a 424-delegate lead over Jackson as the two campaigned for the Democratic presidential nomination.

While optimistic of his prospects in Ohio and Indiana, Dukakis warned his supporters that overconfidence contributed to his 1978 defeat when he ran for re-election as governor of Massachusetts.

"It was the most painful experience of my life," Dukakis told workers in Cleveland.

Jackson criticized Dukakis for not going far enough in committing himself to spend money on such issues as child care, South Africa, education, and drugs.

"We need a massive commitment to invest in people, reinvest in America and end Reaganomics," Jackson said at a rally in Columbus.

He criticized Dukakis for offering $250 million in new education spending saying, "You cannot educate every child in America to go to college on only $250 million."

However, Jackson stopped short of saying that Dukakis would try to pull Democrats toward Republican policies.

"I would not put him in that category," he said. "There are some in the Democratic Party who would pull our party toward conservatism."

Bush also renewed his counterattack on the issue of Attorney General Edwin Meese III, who is the subject of a number of investigations by an independent counsel. Democrats have cited Meese as evidence of a "sleaze factor" in the Reagan administration that will be an issue in the fall campaign.

"I've heard Dukakis and Jackson talk about sleaze. What are they talking about? Who are they talking about?" said Bush. "Are they convicting someone before the system works?"

Bush warned that if the Democrats "want to go down the low road, we'll meet them."