Last week Obama led 50-44% (he had led by that margin since the week of the Republican convention). So this is the first movement in Romney's favor (if you can call it that, w/in MoE) on the Daily Kos tracking poll since the end of August. Not to mention that the party ID of the likely voters is D+7 (the same as 2008 turnout). So if the November electorate looks as Democratic as the 2008 electorate, then Romney trails by about 5 points according to this poll. McCain lost in the 2008 electorate by 7. Romney probably needs to trail in an Obama electorate by 3 or less in order to actually win in November (presuming a less Obama friendly electorate in November).
See rule #7. Or visit unskewedpolls.com, they'll tell you what you obviously want to hear.
Also, a one point shift in a poll with a margin of error of 2.8% is not "movement."