I was going to challenge you on that conclusion, however, I notice you haven't bothered to defend your statements.
There is a lot of pressure on elected officials to evolve left. Some of the reasons it would be in an elected officials self interest are. 1) They will get more favorable media coverage. 2) They can appeal to more moderates. I assume you have heard the saying - run right for the primaries and run left for the general election. 3) More elites will like them and want to hang out with them and, in Trump’s case, do business with his companies.