Big differences:
Bush
1. Border: Secure it (unspecific)
2. Amnesty: favors
3. Illegal residents: make them citizens
4. Immigration laws: No stated position
Walker
1. Border: Build a wall
2. Amnesty: against
3. Illegal residents: penalize existing residents (unspecific)
4. Immigration laws: No stated position
Cruz
1. Border: Build a wall (in some places)
2. Amnesty: categorically against
3. Illegal residents: No stated position
4. Immigration laws: Wants tighter immigration laws.
I’m assuming the positions you listed for Walker are after his “Whitehouse Road” conversion.
Prior to that, he has several quotes saying a border wall was unnecessary, and that he supported a path to citizenship for illegals.
Which Walker should I believe? The one who stated those positions before he was campaigning for the nomination….or the one who is now is now trying to win over conservatives?