About that eagle-eyed ability to parse America's interests, how has it performed with other candidates? Recall this was about placement of missile defenses in Europe
I'm having trouble seeing how the interests of America were being served and not his desire to be re-elected. I would be willing to consider that he might have been motivated by the realization that Russia is a player on the world stage and it is better to work with them when we can, were you to drop the TDS and allow the same consideration for Trump. Barring (or Barrying) that, seems like treason to me
I remember the Obama "more flexibility" comment, and how the right lost their collective minds over it. Now, one can certainly criticize Obama over the comment, as it implies that he can't be upfront with his plans, with the American people, because it could be politically damaging to his re-election campaign. But that is how politics works, and has always worked. The issue with the comparison you're trying to make, is the lack of specifics. There is no implicit threat, nor indication of doing something that is potentially wrong. Conversely, Trump makes it appear that his support for the Ukraine via arms sales is contingent on the Ukraine investigating Biden, a political rival. Whereas Obama is promising "flexibility," Trump was promising "arms." One intangible, and completely open to interpretation and diplomacy, the other not.