Dems got wiped out in 2010 midterms, and the often expressed view from both Obamas was something like "our voters got complacent and didn't bother to turn out" and, well, there were almost 6 million foreclosures total in 2009 and 2010 (more in 2010 than 2009) and the unemployment rate on election day was almost 10%.
Again, choose which villains to blame for that, but I do not think the correct diagnosis of the moment was simply "our voters got lazy."