WASHINGTON — Close to securing the Democratic nomination, Senator Obama lavished attention on Florida and its wreckage of a presidential primary while minding his manners with Senator Clinton — a rival he now can afford to praise.

Mr. Obama detoured today from the campaign for the three remaining primaries — Puerto Rico, Montana, South Dakota — to rally in a state where its renegade primary was disallowed.

“It is good to be back in Florida. It’s good to be back. I know you guys have been holding down the fort,” Mr. Obama told supporters at a Tampa, Fla., rally.

RELATED: Obama Claims Victory After Kentucky Loss.

Mrs. Clinton, too, was in Florida, pressing to narrow her gap with Mr. Obama by having delegates counted from its contest in January.

The former first lady told supporters in Florida that they “learned the hard way what happens when your votes aren’t counted and the candidate with fewer votes is declared the winner,” a reference to the state’s disputed presidential vote that gave Presidential Bush the White House. “The lesson of 2000 here in Florida is crystal clear: If any votes aren’t counted, the will of the people isn’t realized and our democracy is diminished.”

The Illinois senator was just 64 delegates short of the 2,026 needed to clinch the nomination, after two superdelegate endorsements today and a pair of primaries the night before. Mrs. Clinton thrashed him in Kentucky; he answered by winning Oregon.

Mr. Obama also secured a majority of the pledged delegates won in primaries and caucuses across the country — a milestone that could help him persuade more superdelegates to endorse him.

The Mississippi Democratic Party Chairman, Wayne Dowdy, and Rep. Joe Courtney, a Democrat of Connecticut whose district voted for Mrs. Clinton in the state’s February 5 primary won by Mr. Obama, padded the Illinois senator’s lead with superdelegates by declaring their support. Superdelegates are party insiders who are not tied to the outcome of state contests.

Obama picked up another big labor endorsement, from the United Mine Workers of America.

Clinton gained up a superdelegate, too — Craig Bashein of Ohio.

Although Obama won most groups of voters in Oregon, other recent primaries including Kentucky’s have been polarizing, with large numbers of his supporters and Clinton’s digging in behind their candidate and saying they would not vote for the other one in the fall campaign against Republican John McCain.

“If that holds true, then it is a problem,” the former Colorado Senator, Gary Hart, who experienced devastating party divisions as Democrat George McGovern’s campaign manager in 1972. “But I don’t think that’s going to hold true.”

Speaking today on CNN, he said Mr. Obama is right to have turned recently to unifying the party and “he has already, wisely, I think, begun the fall campaign.”

Mr. McCain addressed an enthusiastic crowd in Miami yesterday, Cuba’s independence day, and pledged to hold firm against normal trade relations with Cuba until that country honors basic freedoms.

He criticized Mr. Obama for saying he would meet President Raul Castro, called the Democrat a “tool of organized labor” for opposing a Latin American trade deal, and said his opponent had advocated lifting the trade embargo before shifting his position to say he would merely ease it.

The morning talk shows were barren of the usual candidates or aides trumpeting the previous night’s triumph or explaining away a loss, one sign that the rhetoric of the competition is ratcheting down on both sides despite the trio of primaries to come.

Indeed, Mr. Obama is now abundant in his praise of a Democratic rival who engaged him fiercely and often bitterly over six months. In his Iowa rally last night, the man close to becoming the first black Democratic presidential candidate paid tribute to Mrs. Clinton’s historic effort to become the first female president, saying she “has shattered myths and broken barriers and changed the America in which my daughters and your daughters will come of age, and for that we are grateful to her.”

Democratic rule-makers meet at the end of this month to decide whether to count delegates from Florida and Michigan; the states were striped of their delegates as punishment for holding early primaries. Mrs. Clinton won both states but Mr. Obama had his name kept off the Michigan ballot and neither candidate campaigned in those states.

With 94% of the vote counted in Oregon, Mr. Obama was winning by a 59-41% margin. Mrs. Clinton scored a 35-point win in Kentucky after trouncing him by 41 points in West Virginia last week.

Mr. Obama won Oregon with the support of men and young people, but also found plenty of votes from blue-collar workers who have the staple of Clinton victories in other states, according to surveys of voters. As a group, only those making less than $30,000 a year and those over 65 favored Mrs. Clinton. Women were evenly divided between Mr. Obama and Mrs. Clinton, but men voted for Mr. Obama 2-to-1.

Altogether, Mr. Obama scored a solid win in a heavily white state, a rare achievement in recent races in which blue-collar whites have powered his rival.

In Kentucky, Mrs. Clinton won two-thirds of women and nearly as many men — altogether, seven in 10 whites, who made up nearly 90% of the electorate, exit polls indicated. Mrs. Clinton prevailed among all age, income, and education categories, with particularly large margins among lower-earning and less educated voters.

As he closes in on the Democratic prize, Mr. Obama has been concentrating his campaign more and more on Mr. McCain rather than on Mrs. Clinton.

But Mrs. Clinton insists she still sees a path to the prize by winning over superdelegates, whose support will be needed for either candidate to be clinch the nomination.

Mrs. Clinton won at least 56 delegates from Kentucky and Oregon and Mr. Obama won at least 43, according to an analysis of election returns by The Associated Press. All 51 delegates from Kentucky were awarded but there were still four of 52 to be allocated in Oregon.

Mr. Obama has an overall total of 1,962 delegates, including endorsements from superdelegates. Mrs. Clinton has 1,779, including superdelegates, according to the latest tally by the AP.