Anthony D. Weiner

Campaign tweet-fight! Clinton, Trump camps brawl on Twitter

Donald Trump and Hillary Clinton are engaged in their first full-blown Twitter war.

Trump started it, mocking President Barack Obama's endorsement of the presumptive Democratic nominee on Thursday.

"Obama just endorsed Crooked Hillary. He wants four more years of Obama_but nobody else does!" Trump tweeted.

Clinton's campaign responded with an epic troll: "Delete your account," her campaign replied.

The message marked a departure for the often cautious Clinton and quickly went viral, getting retweeted 130,000 times in about an hour. It was a campaign milestone: Clinton's most retweeted tweet.

"Delete your account" is a...