Layla herself has previously pointed out that the Garratts would never vote for a "Liberal", let alone Trudeau.   As members of the PAoC, they are part of a socially conservative, evangelical Christian movement which very strongly supported Harper in both his leadership bid and in the elections which followed.    The PAoC, along with other Christian Right groups (eg:  Charles McVety) do not like "Liberals" because of their stance on abortion, gay rights, etc.    

Kudos to Kevin Garratt for thanking Trudeau, which was probably not easy for him.