Hillary Clinton is keeping tight-lipped about her plans for Wednesday, the day after the final two Democratic primary contests, but her husband, former President Bill Clinton may already have thrown in his towel.

"This may be the last day I'm ever involved in a campaign of this kind," he told South Dakota voters on Monday.

South Dakota and Montana hold Democratic contests on Tuesday, capping an extraordinarily long primary season that will not result in either Clinton or Barack Obama receiving enough pledged delegates to seize the nomination.

The Clinton campaign said Hillary Clinton is not dropping out of the race after South Dakota and Montana's returns come in, and has denied it's making staff cuts.

"There are no more primaries so there is nowhere to send them," said adviser Harold Ickes, insisting the campaign was now focused on the remaining superdelegates and not on individual states.

Hillary Clinton has also not let on that she has any intention of quitting until one candidate reaches the magic number of 2,118 delegates needed to win the nomination. Obama is just over 40 delegates shy of that goal.

Bill Clinton's statement, which took many observers and pundits by surprise, may just bespeak the obvious. Tuesday is the last primary day, and Bill Clinton will not have a chance to participate in a race like this again for obvious reasons.The Democratic primary race ran two historic candidates -- the first woman so close to seizing a major party nomination, and the first African-American man, who is likely to be the major party nominee.

Bill Clinton is also unlikely to participate in the next campaign unless Hillary Clinton is involved, a fate that is still unknown.

His comment was chalked up by some Democrats as more a byproduct of fatigue than an attempt to concede. Others said it doesn't make sense for him to suggest his wife's campaign is done.

"You have to understand how emotionally draining it is for any candidate, whether it's Senator Obama or Senator Clinton, especially in this difficult spot when you know the math just isn't there and this thing is coming to an end. ... It's been an historical primary race. It has lasted seemingly a lifetime. I mean it takes a lot out of you, it doesn't matter who you are," said Chris Kofinis, a Democratic strategist and former aide to presidential candidate John Edwards.

"When you get tired, you make a lot of comments. I think we've got to not over-read this," said Democratic National Committeewoman Debbie Dingell. "The reality is the primary season ends tomorrow. We're all going to have enormous pressure what is going to happen inside the party. And the time has come to start to unify."

"I guess it's technically true that it's the last primary, but if she was going to stay in the race, then there would be more campaigning to do," said Democratic strategist and FOX News contributor Kirsten Powers. "She'd only stay in the race if presumably she was trying to become the nominee and he would still be campaigning I assume, so that doesn't really make sense."

Clinton is to deliver her final primary night rally speech in New York. She is expected to celebrate all the benchmarks she has established during the campaign, including all of her victories in swing states, including in Pennsylvania, West Virginia, Ohio, Michigan and Florida, a list that she has used to make the case to superdelegates that she is the stronger nominee.

Speaking to supporters in Rapid City, S.D., on Monday, Clinton said she's leading the popular vote race by more than 300,000 votes -- a number that would include Michigan without giving the uncommitted voters in that state to Obama. It is the basis for her argument that she should be the nominee. Indeed, two new superdelegates -- one from Louisiana and one from New York -- announced Monday they would support Clinton.

The campaign is "going to make our case to all of the delegates, as to who is the best president, number one, because that is the most important question, and number two, who would be the stronger candidate against John McCain. And I believe on both of those questions I am the person who should get the support to get the nomination for our party," Clinton said.

Even if she loses South Dakota and Montana, Clinton will not drop out of the race due to intricacies of campaign finance law. A "suspension" of her campaign would allow her to raise money and jump back in to the race if an opportunity arose.

Her campaign could also still contest the 69-59 split of Michigan delegates between her and Obama, who was not on the ballot in the state penalized along with Florida for holding an early primary.

By staying front and center, even on the sidelines, Clinton may also be vying for a key post in a potential Obama administration, possibly even vice president. But that selection could be weeks in the making.

"Most Democratic supporters will give him a few weeks to let the general election begin," Kofinis said. "Probably for a month or two. Maybe longer." If that is the case, he said, Clinton will not want to have disappeared.