During the Maine GOP caucus on March 5, candidate Ted Cruz came out on top with about 46 percent of the vote.  Based on the caucus result Cruz was allocated 12 delegates, leaving nine for Trump and two for John Kasich.

Maine’s Governor Paul LePage coordinated with the Cruz camp, the Trump camp and the Kasich camp to insure the state convention would provide equitable distribution of the delegates based on the caucus result.
This is called a “unity ticket”, with delegates assigned based on the results of the caucus.
However, during the state’s convention this weekend the Cruz campaign reneged on the agreement and stabbed the caucus voters in the back.  As they have in other state contests, Team Cruz manipulated the delegate selection to gain 19 of the 2o delegates.   CNN has more on the events:
(Via CNN) […] Cruz collected 19 of the 20 spots up for grabs, with the 20th spot going to Maine Gov. Paul LePage, who’s supporting GOP front-runner Donald Trump.
The fight at the state’s convention Saturday underscores the intense battle for delegates heading into the Republican National Convention in July. Cruz’s campaign is pushing for every delegate it can collect to prevent Trump from winning the 1,237 he needs to win the nomination outright and force a floor fight. Even with Saturday’s developments, both Cruz and Ohio Gov. John Kasich need to win more delegates than are available in the remaining primary contests to win the GOP nomination on the first ballot.
Ahead of the vote, LePage accused the Cruz campaign of going back on a promise to back a “unity slate” of the state’s delegates, a move he portrayed as “stabbing us in the back.”
In a statement, LePage said, “We reached a deal with Cruz’s national campaign to put up a unity slate that would honor the wishes of the thousands of Mainers who voted at caucus. But Cruz’s Northeast Political Director David Sawyer lied to us and broke the deal. Sawyer stabbed us in the back, reneged on the unity slate, and betrayed the people of Maine.”
Though he singled out Sawyer in his statement, LePage said the actions were emblematic of the Cruz campaign. “As we have seen throughout the country, Cruz’s national campaign is run by greedy political hooligans.”  (read more of the manipulative mess)