Bernie Sanders Wins Oregon Primary

 Hillary Clinton held a slight lead over Bernie Sanders in the Kentucky primary on Tuesday, as the waning weeks of the Democratic contest have turned particularly bitter among supporters and surrogates.

The race was still close to call with about 99% of the votes counted. Clinton claimed victory late Tuesday.

Sanders won the primary in Oregon, in line with expectations that the state's liberal voting base was expected to favor the Vermont senator.

Speaking to supporters in Carson, Calif., where backers lined up hours before his event at a tennis stadium, Sanders said that "we are in until the last ballot is cast."

He predicted victory in California, which holds its primary on June 7.

But Clinton's apparent victory in Kentucky is a rebound from losses to Sanders in recent primaries in West Virginia and Indiana. A loss would have been embarassing for her campaign, although it wouldn't have disrupted her path to the nomination.

Some of Clinton's supporters are expressing increasing frustration with Sanders, particularly after last weekend's chaotic state convention in Nevada. Sanders supporters booed Sen. Barbara Boxer (D-Calif.), one reportedly threw a chair, and the state party leader complained of receiving death threats.

In a statement on Tuesday, Sanders said that the Democratic leadership in Nevada "used its power to prevent a fair and transparent process from taking place." He also called the claim that his campaign "has a penchant for violence" "nonsense."

Clinton's backers increasingly worry that Sanders' presence in the race, even when his chances of capturing the nomination are very slim, is only exacerbating divisions and preventing her from focusing on the general election and presumptive GOP nominee Donald Trump.