I was just researching that. I'm sorry to have to burst that bubble, but some things have GREATLY changed this time around.
The first is that two major powerhouses are in this race against Edwards. In '91, Bush I had been seen as "impossible to unseat" due to his huge popularity because of the Gulf War. Therefore a lot of big names stayed out of the race, and by the time it became clear that he WAS beatable, it was too late for them to enter. Almost certainly the unknown Clinton could not have made a comeback against the big names who stayed out (Gephardt & Cuomo to name a couple) after the embarrassing revelations early on that dropped him to single digits.
"Meanwhile, Tsongas, having started as a longshot candidate, won several primaries (Maryland, Arizona, Washington, and Utah), but found that there was insufficient time to accumulate funds after his surprise New Hampshire win (this was before Internet fundraising existed as a possibility), and withdrew after crushing losses in the Michigan and Illinois primaries<1> before certain large-state primaries (most notably, New York). Brown, who had done so poorly in the early primaries, was about to lose his matching funds until he unexpectedly emerged victorious in Colorado."
http://en.wikipedia.org/wiki/Democratic_Party_%28United_States%29_presidential_primaries%2C_1992#CandidatesAlmost EVERYTHING which contributed to Clinton's path to the WH is missing or changed this time around. And I say this as a wholehearted Edwards supporter. The staggering amount of money needed to win the WH, which has essentially made it nearly impossible to win if you accept matching funds... well, let's just say the odds are much different this time around for someone attempting to make a comeback. I'm still not giving up till Edwards does, but it's starting to look like the best he can hope for is a brokered convention.