Receiving oppo from foreign sources

Ace of Spades notes,

A lot of the people claiming it is grossly unethical to receive oppo from a foreign source sure seem to doing a lot of receiving of oppo from foreign sources.

...For years, American political operatives (usually Democrats) have gone over to foreign countries to help get socialists elected. Am I really supposed to believe there are no reciprocal back-channel exchanges going on, where grateful foreigners report to Democrat operatives what their spy services have dug up on Republicans?

Read much more here.