When I was posting the tightening, those four polls were the ones out. PPP looked like an outrider at the time (2/12). We did also have the ARG numbers all over the place.
No, you posted about the tightening on the evening of Feb 18th. At that time, the PPP poll from 02-17 (which was consistent with their result from 02-12) had already been added to the forum database. Even if we exclude ARG and give you the benefit of the doubt and exclude the 02-12 PPP poll as an outlier, we're left with a sum total of three polls for 2008; all of which had Obama holding steady with a 4 point and then 5 point lead.
On what evidence, therefore, were you basing the assertion that the race was tightening?