They both have a easy win against Adam but I think if Porsche wins & not take Rachel she'd vote Adam to win out of spite.
Porsche can still win
IF she wins the final HOH which is always a crapshoot she could still win.
Here's how the votes stands now: (IMO)
Porsche - Dani, Kalia, Shelly
Rachel - Brendon, Jeff, Jordan
Adam will continue his reign as the swing vote
Adam just comfired to Rachel he will vote for whoever wins F3...Porsche still has a chance.