It would be very unusual for anyone else currently entered (and, for that matter, anyone that I can think of at this moment) to be ahead in the polls or in the odds. At this point in 2007, she was also favored in the polls:
"Among Florida Democrats, 34 percent of those polled support Sen. Hillary Clinton of New York for the Democratic presidential nomination. The senator from New York is far ahead of her rivals in the new survey by Quinnipiac University. Sen. Barack Obama, D-Illinois, is in second place at 16 percent."http://politicalticker.blogs.cnn.com/2007/06/07/
...but there was a contender moving up in the field challenging her within her party:
Hillary Clinton: 3-1 (Much has changed in the past 6 weeks since I last posted. The Clintons are scrambling to deal with an effective challenge from the left by Obama. But they are old pros and it'd be a mistake to count them out. She's still the favorite, but also is her own worst enemy.)
Barack Obama: 6-1 (Running a very solid campaign so far. Stealing a good amount of traditional Democratic money away from Hillary, while clinging to the (mis)perception of being an outsider. I still think he ends up as the veep choice, but he's definitely got a shot.)http://politicalspectrum.blogspot.com/2007/03/big-daddys-presidential-odds-vol-2.html
She is pretty much all alone in the Democrat field, unlike 2007:
"Hillary Clinton dominates among Democratic voters nationwide, with 57 percent, compared to 60 percent April 23. U.S. Sen. Bernie Sanders of Vermont has 15 percent with Vice President Joseph Biden at 9 percent. No other candidate tops 1 percent with 14 percent undecided."
...and, as the only currently viable candidate, also wins head to head polls against the relatively unknown Republican field:
"In a general election matchup, Clinton gets 46 percent of American voters to 42 percent for Paul and 45 percent of voters to 41 percent for Rubio. She leads other top Republicans:
46 - 37 percent over Christie;
47 - 40 percent over Huckabee;
47 - 37 percent over Bush;
46 - 38 percent over Walker;
48 - 37 percent over Cruz;
50 - 32 percent over Trump." http://www.quinnipiac.edu/news-and-events/quinnipiac-university-poll/national/release-detail?ReleaseID=2228
Hillary Clinton has been the First lady, a Senator, and Secretary of State. Her husband was the President. There is no realistic way for any of the candidates to have much higher name recognition at this point in the campaign. Name recognition is more important that substance at this point; that comes later in the campaign.
She'll have a clear path to the nomination; I expect her to stay the favorite overall at least until the strongest candidates emerge on the other side. Once it narrows down and those folks go through the ups and downs of being rectally examined by the press and attacked by their supposed friends, we'll get to the substance of the election. We'll see what happens after that!