The candidate who seems to have been running forever and the one who has yet to enter the race are leading their respective nomination contests in a national preference poll by Zogby International.

The latest Zogby survey shows New York Sen. Hillary Clinton with a 37 percent to 25 percent lead over Illinois Sen. Barack Obama. Former North Carolina Sen. John Edwards is a distant third at 12 percent, while New Mexico Gov. Bill Richardson leads the also-rans with 4 percent.

Clinton’s edge over Obama has shrunk slightly since late May - she has lost two points and Obama has gained 1 percent since that last Zogby poll of the race. Eighteen percent of Democrats remain undecided, the same as in late May.

The survey shows Clinton has picked up steam, especially among younger Democratic voters. She wins 59 percent support among those aged 18-29, up 10 percent since late May. Meanwhile, Edwards has lost significant ground in the same demographic. In fact, lower tier candidate Dennis Kucinich, at 6 percent among those under age 30, has more support than Edwards in that group.

Clinton has also maintained her base of support among moderates, while expanding her support among progressives to 36 percent, up from 31 percent two months ago. Her backing among progressives appears to come out of Obama’s liberal base, as he has slipped from 35 percent to 27 percent in that group.

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