go across to something—change one’s political beliefs and join another group:
- I am disappointed Simpson has decided to go across to the Democrats, especially after fighting them so actively in the past.
go over to something—
1. = go across to something:
- Stalin, on the other hand, did not like to see such a figure go over to the opposition.
2. give up one’s practice, interest, etc. and take on another:
- I’ve tried to go over to another instrument before, the banjo. Didn’t work out.
3. (Radio, TV) switch a broadcast to another place:
- And now, we go over to Paris for up-to-theminute news about the President’s visit.