Much of the media’s discussion of the GOP “losing the suburbs” frames the issue in a way to flatter the sensibilities of liberals and Democrats (the two parties split 49-49 in the suburban vote according to exit polls).
The Democrats actually did slightly better in the suburbs in 2006 and 2008 and only slightly worse than 2012 when GOP dominated the House of Representatives elections.
The reality is that the Democratic Party has become the party of the rich (including rich suburbs) and the poor, and the GOP the party of the forgotten and increasingly disempowered middle class.
Want proof? At the conclusion of the election, Democrats control all 20 of wealthiest congressional districts in the country (They won the top 10 by an average vote of 65-34 percent).