Nate Silver of FiveThrityEight.com, who set the whole Kos/Research 2000 mess into motion with his downgrade of the pollster, asks that question:

Talking Points Memo received a long and somewhat rambling e-mail from Research 2000′s Del Ali concerning the accusations from Daily Kos that it has fabricated some or all of its polling data. In the e-mail, Ali suggests another mechanism by which some of the unusual patterns observed in Research 2000′s polling data might have occurred.
To you so-called polling experts, each sub grouping, gender, race, party ID, etc must equal the top line number or come pretty darn close. Yes we weight heavily and I will, using the margin of error adjust the top line and when adjusted under my discretion as both a pollster and social scientist, therefore all sub groups must be adjusted as well.
[Note: Some of Mr. Ali’s typographical errors have been cleaned up and the emphasis is mine.]
Although it is not crystal-clear what Ali is suggesting, one interpretation is that he feels he has the liberty “under my discretion as both a pollster and social scientist” to adjust his topline results anywhere within the margin of error. Thus, if his raw data had the Democrat at 46 percent and the Republican at 44 percent, and had a margin of error of +/- 4 percent, the Democrat’s number could presumably be adjusted by Ali to be anywhere from 42 percent to 50 percent, or the Republican’s anywhere from 40 percent to 48 percent. As you can see, this would give Ali quite a bit of discretion: he could adjust his poll to show essentially anything that he wanted, from a decent-sized lead for the Democrat to a modest one for the Republican. Needless to say, this is not what they teach you in Polling 101. There are differences of opinion about whether pollsters should just report their numbers “as is” no matter what, or whether, if the result “feels wrong” to them, they should have the liberty to re-examine their assumptions, such as by applying a different likely voter model. Now, in practice, a pollster will usually have enough knobs to twist between likely voter screens, weighting and sampling assumptions, etc., that they could back into almost any result they wanted more often than not. But there would usually be some scientific pretense for it. Ali’s attitude seems to be considerably more cavalier and his process considerably more ad-hoc.

The rest here.