I am a bit surprised by this:
CNNGALLUP found that 51 percent say they definitely won’t vote for Clinton (D-N.Y.) in 2008, another 32 percent might consider it, and only 16 percent vow to back her. That means committed anti-Hillary voters outnumber pro-Hillary voters by 3-1. The poll suggests she can forget about crossover votes – 90 percent of Republicans and 75 percent of conservatives say there’s no way they’d back her.
Hillary has recently embraced somewhat hawkish policy policy positions in an effort to move to the center. This probably did her no good with conservatives, and may well have cost her some liberal votes. She has been under fire from “peace mom” Cindy Sheehan (who now says Hillary’s husband killed more Iraqis than Bush has, via Professor Reynolds), which has certainly hurt her standing among liberal peaceniks.
This poll is early, as things certainly could change by 2008. It does seem to indicate, however, that Sen. Clinton’s attempts at wooing moderate and conservative voters have so far been unsuccessful.

