From this article in the NYT on Larry Summers:
For someone said to be poor at reading others, Mr. Summers has often displayed keen political instincts; after the Sept. 11, 2001, attacks, he had urged Harvard students to support the government and spoke out in support of its embattled R.O.T.C. chapter. Now, struck by the harsh consequences of globalization and income stagnation even among college graduates, Mr. Summers, known as a centrist as Treasury secretary, moved left, and in a very public forum.
Uh, that’s not “keen political instincts.” I believe that’s what we call “jumping on the bandwagon.”