Why Did A Billionaire With A Liberal Ideology Give $150 Million To GOP Candidates?

A billionaire casino owner supported Newt Gingrich in the GOP primaries.  He switched to Romney after he beat Gingrich in the primary campaign.  In a recent interview he described his political views which are further to the left than those of many democrats, and light years away from those of the GOP.  He is being investigated for some of his policies the operation of his casinos, and in his efforts to get a foreign license.  It seems easier to explain his support for the GOP in terms of favors that he might have anticipated for the candidates that he supported.