Democrat battle hinges on super-delegate vote

NECK-AND-NECK COMPETITION: Currently, Obama has 1,932 total delegates, while Hillary has 1,753.

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Forty-one per cent of Hillary supporters said they'd cast their vote for John McCain, the presumptive Republican nominee, and 23 per cent said they would not vote at all.

Just 33 per cent said they would back Obama in the general election, according to the polls.

Those numbers are even worse for Obama than in West Virginia one week ago, where 36 per cent of Hillary voters said they would back him in the fall.

A majority of Democrats in both states think Obama will be the party's nominee, according to exit polls.

The Kentucky and Oregon primaries hold 103 delegates combined. Obama needs 15 more to achieve a majority of the pledged delegates – the delegates won either in state caucuses or primaries.

Obama is the favorite in Oregon, where a CNN poll of polls indicates that he has a lead of 10 percentage points. Oregon's primary is a mail-in only contest, which means voters must mail in or hand in their ballots in person by 8 pm Pacific Standard Time.

Both Kentucky and Oregon's primaries are closed, so only registered Democrats can vote in the Democratic contests.