There were more democrats than republicans voting in 2012 - that is why Obama won, Sherlock.
In fact, the percent of republican representatives in the House exceeded their vote by a fairly wide margin, which is why the democrats complained about republican gerrymandering, again.
Look, if you will check your attitude at the door, we can have a civil discussion. Otherwise, you can go pound sand.
I followed up with a posting that cited the 2012 results. It was nearly identical to 2008. Neither was D+8, despite your own admission that Republican vote was depressed. That's why a D+8 sample for this election is not reasonable -- something like 2000 is more representative, with a Republican challenger after 2 years of a divisive Democrat President and the Democrat candidate considered a heir apparent. That was D+3.
In fact, the percent of republican representatives in the House exceeded their vote by a fairly wide margin, which is why the democrats complained about republican gerrymandering, again.
Back in the 80's, it was the opposite: Democrats had more House seats than the vote distribution, and for the same reason: gerrymandering.
Republicans started a concerted effort to take control of state legislatures, and it has paid off. In the past 8 years of Obama, it's actually gotten worse for the Democrats.
It will continue until the Democrats start taking back control of state legislatures. But, that's will be difficult when Democrat control tends to lead to financial mismanagement, followed by tax increases, and people migrate to Republican-held states.