I've never seen the maps overrepresent in favor of Obama. Ever.
I am not sure?
But the map give AR to republicans, even in Clinton-McCain matchup. That's because the last poll done (quite a while ago) is also the only one in which Clinton doesn't have the lead.
I think the maps come from a certain site. If I could remember it, I shall give a link.
You shouldn't have to remember it. You should be able to click on the state and get information about what poll was used, when it was taken, etc.
The maps rely almost exclusively on state polling done by Rasmussen and Survey USA. Both pollsters tend to lean conservative, whether by design or the way they state their questions. Until other reputable pollsters start regularly polling the states, the maps are over-reliant on two pollsters with a conservative slant. If you go to pollster.com and real clear politics, you can see that Obama is winning some states that the MYDD maps do not reflect, so the electoral projections are bogus. The point of the maps on the site is to benefit Clinton. Once Clinton officially concedes, we'll see if the maps change.
http://www.openleft.com/
Don't hold your breath. Even if Clinton's goal is not to destroy Obama so she can win in 2012, it IS the goal of many of her supporters.