Hillary Clinton, facing a de facto deadline from party leaders to wrap up the race, still is rallying supporters and rolling out endorsements four days before the final two primaries.

The New York senator was endorsed Friday by the Argus Leader, the largest newspaper in South Dakota, which votes alongside Montana Tuesday.

Her campaign basically has given the OK for supporters to protest on Saturday outside a Democratic National Committee meeting that will take up the disputed Florida and Michigan primaries, which Clinton won but were discounted because the states held early primaries in violation of party rules.

And Clinton even rolled out the endorsement of Puerto Rican superstar Ricky Martin Thursday in an attempt to win over voters before the island territory's Democratic primary on Sunday.

But even the Argus Leader acknowledged that Clinton probably will not win. There are just three primaries left, and none offers her enough delegates to close Barack Obama's lead of more than 200 delegates.

"At the time of this writing, [Obama's] mathematical advantage is considerable. His appeal also is clear, and his campaign has been strong," the newspaper printed in its Friday editorial. "Clinton might not win this race. In fact, it's a long shot. But whatever some might say, the race is not over, and her name is on the ballot. Win or lose, she's also the best Democratic candidate for South Dakota."

The Argus Leader wrote that "her mastery of complex policy detail is broad and deep, and her experience as a senator and former first lady matches that."

Interestingly, the Argus Leader is the newspaper to which Clinton made her controversial comments a week ago about the 1968 assassination of Robert Kennedy.

During a meeting with the editorial board, Clinton invoked the assassination seemingly as a way to explain why she is continuing her underdog bid for the nomination. She later apologized and said she was only referring to the fact that some primary contests last through the summer.

Clinton is campaigning in Puerto Rico on Friday as Obama hits the trail in Montana.

The last-minute campaigning comes as party elders signal they're ready to clap off the lights on the race.

Senate Majority Leader Harry Reid said Thursday that Democratic leaders are going to push for a quick end to the contest after the final primaries Tuesday and will pressure uncommitted superdelegates to choose sides.

Democratic officials said House Speaker Nancy Pelosi already has begun contacting uncommitted House members urging them to weigh in soon after the primary season ends.

Pelosi also told the San Francisco Chronicle she will "step in" to prevent anyone from taking the nomination fight to the August convention. She said she expects the race to be over in two weeks.

Pelosi is uncommitted but has said she will pledge her support to whomever leads in pledged delegates -- that undoubtedly will be Obama. Obama backers in the House expect many fence-sitting superdelegates to follow Pelosi's lead.

Even though the Argus Leader endorsed Clinton, the Illinois senator still has most of the major endorsements in the state, with six of its seven superdelegates and former presidential candidate and Sen. George McGovern supporting him.

FOX News' Major Garrett and The Associated Press contributed to this report.