Siena's polling demonstrates some movement toward Doug Hoffman (C) since its last polling, but unlike PPP, it shows him well under 50%.  Its latest results show Hoffman with 41% of the vote, Democrat Bill Owens with 36% of the vote, and Scozzafava still getting 6% of the vote. 

Digging down into the crosstabs -- always a dangerous chore since the margin errors are usually very high -- we can see that 24% of the self-described liberals are undecided, while 9% of the moderates and 14% of the conservatives are undecided.  Similarly, 18% of Indepdents are undecided, 17% of Democrats, and 14% of Republicans are undecided.

This could well mean that there more room for growth for Owens than for Hoffman (you can't even tell this much without knowing what percentage of the sample self-describes as liberal, moderate, or conservative).  On the other hand, voters who are undecided this late in the game are likely to stay home rather than vote.  And, of course, you'd always rather be up by 5 than down by 5 the day before and election.