Hillary Rodham Clinton has coasted to a substantial victory in West Virginia.

Clinton won at least 15 of the 28 delegates at stake in West Virginia, with 13 more to be allocated.

That left Obama with 1,875.5 delegates, to 1,712 for Clinton, out of 2,025 needed to clinch the nomination at the party convention in Denver this summer.

It has been one of Barack Obama’s worst defeats for the Democrat presidential nomination, with Clinton trying to overcome emerging Democrat thought that Obama had effectively wrapped up the nomination last week with a victory in the North Carolina primary and a narrow loss in Indiana.

The West Virginia defeat has once again shown up his weakness among blue collar voters.

Clinton's aides are contending that Hillary Clinton’s strength with blue-collar voters, which has already been demonstrated in primaries in Ohio, Pennsylvania and Indiana, makes her the more suitable Democrat candidate.

Oregon holds the next primary in a week’s time.