Rep. Richard Gephardt of Missouri, who decided to seek re-election after failing in his bid for the Democratic presidential nomination, has easily won re-nomination for a seventh term in the House.

Missouri joined Kansas and Michigan in holding primary elections Tuesday in which eight of Missouri's nine congressmen sought re-election.Gephardt and his colleagues faced only token or no opposition in their primaries.

Detroit voters dealt Mayor Coleman Young a losing hand by rejecting his dream of casino gambling, while the Missourians bailed out their struggling lottery by raising the jackpot limit.

Michigan Republicans, choosing between two millionaire ex-congressmen, picked Jim Dunn to challenge liberal Democratic Sen. Donald Riegle.

Kansas had one congressional incumbent facing a challenge - GOP Rep. Jan Meyers, who tallied 85 percent of the 3rd District vote against Charles B. "Bat" Masterson, a retired school adminstrator.

The Detroit vote marked the third time in 12 years that Young, who is expected to seek re-election next year, has seen his plan to boost the local economy by building hotel-casinos set back at the polls.

With votes counted in 811 of the city's 821 precincts, the ordinance outlawing casinos was approved 73,306 to 45,706, or 62 percent to 38 percent.

"This is sending a message to the administration that we are the ones in charge here, not he," said the Rev. Keith Butler, of the Alliance Against Casino Gambling.

But Frank Stella, a member of the mayoral study commission that recommended casinos, blamed the defeat on poor organization and said: "Casino gaming is going to come to Detroit sooner or later."

Supporters of the Missouri amendment called it crucial to the future of the 2 1/2-year-old lottery, which had been suffering because of competition from surrounding states.

Previously, exactly 45 percent of sales money had to go to prizes, 45 percent to the state and 10 percent to administrative costs. Now a minimum of 45 percent must go for prizes, and officials say they want give away about 50 percent and also spend more on advertising.

Betty Hearnes, 61, whose husband, Warren, was governor from 1965-73, will attempt to become Missouri's first woman governor by unseating Republican Gov. John Ashcroft, who did not face a primary.

"You'll see it start to heat up between now and November," Hearnes said in claiming victory. "Now when Ashcroft flies around the state, he can't get away with saying he's not campaigning."