Probably no conspiracy - like you say, everyone is at least a little bit politically motivated. Without invoking a conspiracy, however, it's plainly obvious that Wikipedia is a high value target for manipulation and every political party, 3 letter agency and PR firm has some incentive to obtain and maintain influence over certain Wikipedia articles. Much of the influence is actually exercised indirectly by influencing virtually every media publication that Wikipedia will accept as a valid source.
The thing is, everybody is politically motivated, whether your actions directly affect an organized political party or not. Labeling these specific edits as such is not really saying anything. If there is clearer evidence of a pattern then sure, let's have at it. Until then I remain unconvinced that there is any sort of conspiracy involved here.