[throwaway3060]

None of which has anything to do with which countries politicians feel most comfortable visiting. If the political class felt much affinity with Mexico (rightly or wrongly), I imagine that there would be much less talk of a border wall. Clearly they do not feel the same way about Canada.

I doubt that there are recorded numbers just for politicians, but these are all popular destinations for Americans in general. Now, if there's something else odd about this statistic other than just the number you want to point out, that's a different story.