Bill Schneider

On the eve of a national Democratic presidential debate in Las Vegas, a CNN/Opinion Research poll of Nevada Democratic caucus-goers shows Hillary Clinton over the magic 50% mark for the early January 19 caucus in the Silver State. Clinton leads Barack Obama by a 51%-23% margin, with John Edwards at 11%.

The other Democratic candidates are still polling in single digits: Bill Richardson (5%), Joe Biden (4%), and Mike Gravel and Dennis Kucinich (1%). Christopher Dodd has less than 1% of the vote in the poll released earlier today.

"Clinton's advantage among Democratic caucus-goers appears to be based on the perception that she is the most electable candidate and the strongest leader in the field," said Keating Holland, the CNN Polling Director.