That sound you hear is Republican heads exploding:

We recommend @HillaryClinton for U.S. president https://t.co/eWtGJexQqz pic.twitter.com/CazHEkM2pX

— Dallas Morning News (@dallasnews) September 7, 2016

The Dallas Morning News has been a Republican stalwart for decades. The last time they endorsed a Democrat was before WW2.