These are some interesting results, as if we had a blanket primary, with all candidates on a single ballot. It's a WSJ Online Poll so take it for whatever it's worth...
Hillary Clinton Leads Pack
Of '08 Hopefuls, Poll Indicates
THE WALL STREET JOURNAL ONLINE
February 14, 2007
Sen. Hillary Clinton (D., N.Y.) is leading the pack of presidential hopefuls as the campaign for the 2008 election begins, a new poll indicates.
The Harris Interactive poll, which was conducted online Feb. 2-8, among 3,423 adults, shows that 20% of U.S. adults would most likely vote for Ms. Clinton if they had to choose one candidate from a list of those who may run. Ten percent of those surveyed said they would vote for Sen. Barack Obama (D., Ill.) and 8% said they would choose former New York City mayor Rudolph Giuliani.
Take a look at who is in the running for the 2008 presidential election, who's out and who's somewhere in the middle.The poll indicates that for 45% of respondents, their first choice for president would be a Democratic candidate, while 31% would choose a Republican candidate.
<SNIP>
Forty-one percent of Republicans polled indicated they would consider a Democratic leader for president, while 35% of Democrats said they would consider a Republican candidate.
*******
"If you could vote for one candidate, who would you most likely vote for?"
Base: All adults
PARTY ID
TOTAL Republican Democrat Independent
Hillary Clinton 20% 4% 36% 16%
Barack Obama 10 3 18 8
Rudy Giuliani 8 21 2 6
Colin Powell 6 12 2 6
John McCain 6 15 1 5
John Edwards 5 1 9 4
Al Gore 4 1 7 4
Newt Gingrich 3 8 1 1
Condoleezza Rice 3 6 * 2
Mitt Romney 1 3 - 1
Mike Huckabee 1 2 * *
John Kerry 1 * 2 1
Bill Richardson 1 * 1 1
Joe Biden 1 * 1 1
Joe Lieberman 1 * * 1
Other** 12 N/A N/A N/A
Not at all sure 15 13 14 18
* less than 0.5%
**Note: Elizabeth Dole, Tom Tancredo, Tommy Thompson, Sam Brownback, Michael Bloomberg, George Pataki, Chuck Hagel, Bill Frist, Duncan Hunter, Wesley Clark, Dennis Kucinich, Mark Warner, Russ Feingold, Evan Bayh, Howard Dean, Chris Dodd, Mike Gravel, Tom Vilsak and Frank Keating were all listed and were chosen by less than 0.5%, were all listed and were chosen by less than 0.5%
http://online.wsj.com/public/article/SB117139500515407551-BvJ5YLbrUKcxHXAjxVMf9s5Gg2g_20080213.html