Barack Obama, having now secured a majority of pledged delegates, is inching ever closer to securing the Democratic presidential nomination.
Obama, including Tuesday's primary victory in Oregon, has won 1,642 pledged delegates in primary and caucuses held so far -- enough for a majority.
Overall, including superdelegates, Obama has a total of 1,956 delegates. Clinton, including superdelegates, has 1,776, reports The Associated Press.
Obama is expected to climb within 60 delegates of the 2,026 delegates needed to clinch the nomination after results from the Oregon primary are fully counted Wednesday.
Obama currently has a 58-42 per cent margin over Hillary Clinton in Oregon with 88 per cent of the vote counted.
In Kentucky, Clinton easily won that primary by about 35 points over Obama. With all of the votes counted, she had 65 per cent support, while Obama had 30 per cent.
"There's only a handful of tiny contests to go," Allan J. Lichtman, presidential historian for American University, said Wednesday. "The basic shape of this race is not going to change.
Lichtman, speaking to CTV's Canada AM, said the only thing left to decide is if Obama will create a "dream ticket" by picking Clinton to run as vice-president.
However, despite the odds, Clinton has vowed to continue her bid for president.
"Neither Senator Obama nor I will have reached that magic number when the voting ends on June 3," she said Tuesday night in Kentucky.
"And so, our party will have a tough choice to make -- who's ready to lead our party at the top of our ticket, who is ready to defeat Senator McCain in the swing states and among swing voters."
Both candidates are spending Wednesday campaigning in Florida.
Clinton, counting results from Florida and in Michigan, claims she is ahead of Obama in the popular vote.
But the Democratic Party disqualified the two states because they changed their primary dates without authorization.
As a result, Clinton is pushing for the party to count votes from the two primaries.
Neither Obama nor Clinton campaigned in those states, and Michigan did not even have Obama on its ballot.
Obama is planning to spend several days in Florida -- a state which will be a prime battleground in the fall campaign against Republican John McCain.
The three remaining primaries are Puerto Rico, Montana and South Dakota.
With files from The Associated Press
