"As the race stands now, with Republicans in charge of both Houses, there is a good chance that my candidacy could lead to the election of Donald Trump or Senator Ted Cruz. That is not a risk I can take in good conscience."
http://www.bloombergview.com/articles/2016-03-07/the-2016-election-risk-that-michael-bloomberg-won-t-take
http://www.bloombergview.com/articles/2016-03-07/the-2016-election-risk-that-michael-bloomberg-won-t-take