GOP Districts Isolated From Growing Demographic Changes

"...Following the 2010 census, Republican legislators in key states redrew congressional districts in ways that favored their candidates. That helped House Republicans maintain a 33-seat majority in the 2012 election, but it left many House Republicans largely isolated from demographic changes sweeping much of the country..."

http://www.huffingtonpost.com/2014/03/31/gop-districts-demographic-changes_n_5062204.html