Why did the Democrats lose so badly in 2010?

[Lothal1]

Short rundown: The economy was still bad, despite the stimulus and bailouts. Obamacare was not rolled out well. In Maryland, the healthcare website didn't even work. The stimulus rallied the base and the unpopularity at the time of Obama and the bad economy ended the electability of many of the Democratic governors and their successors. This got Tom Corbett, Dan Snyder, John Kasich and many others elected. Finally, many Democrats don't vote in midterms.

[Lothal1]

2010 is extremely obvious- weakest point of employment combined with Obamacare/cap and trade anger.  The 2014 GOP wave is the harder one to explain, particularly as it is very rare for a party to get wiped out during both midterms of the same presidency.

Yeah, 2014 made even less sense especially given that the economy was quite good by that point.

Well, in 2014, the Democrats had some very weak candidates, while the GOP did exactly what the 2012 autopsy said to do, and ran strong campaigns in states like Maryland, Colorado, Massachusetts, and Texas. Meanwhile, in the same states, the Democratic candidates ran one issue campaigns on abortion and other unappealing hot topic social issues.