A new Quinnipiac poll shows Ben Carson leading Donald Trump 28 percent to 20 percent, with Marco Rubio in third place at 13 percent and Ted Cruz in fourth at 10 percent. This is the first poll in four months that shows Trump losing Iowa, according to RealClearPolitics.

Donald Trump responded to the news by sharing a tweet suggesting that Iowans are stupid:

Update: A few hours later, Trump blamed an intern for sharing a tweet that suggested Iowans are dumb:

The young intern who accidentally did a Retweet apologizes.

— Donald J. Trump (@realDonaldTrump)
October 22, 2015