Clinton, Sanders in tight Ky. race; Sanders, Trump win Ore.

Clinton holds a commanding lead of nearly 300 pledged delegates over Sanders and a dominant advantage among party officials and elected leaders known as superdelegates.

Tuesday's elections took place amid new questions about party unity following a divisive weekend state party convention in Nevada.

Supporters of Sanders tossed chairs and made death threats against the Nevada party chairwoman at the event in Las Vegas, arguing the party leadership rigged the results of the convention in favor of Clinton.

In a sign of the tensions between the two sides, Sanders issued a defiant statement Tuesday dismissing complaints from Nevada Democrats as "nonsense" and said his supporters were not being treated with "fairness and respect."

The billionaire businessman picked up nine delegates earlier Tuesday in Guam, which held its territorial convention in March, and had 1,143 delegates heading into the Oregon contest — fewer than 100 delegates short of the 1,237 he needs to clinch the nomination.

Clinton's husband, former President Bill Clinton, was the last Democrat to carry the state in a presidential election — he won Kentucky in 1992 and 1996 — and the former first lady tried to emphasize those ties in the days leading up to the primary.