I used to hate Bush, and I supported Obama and the Democrats in 2008 because of my parents + my teachers + the Dutch media who are all anti-Republican + basically everybody in the Netherlands. Even the most right-wing politicians will be very careful in publicly saying that they support the GOP.
It was only around 2010/2011 when I really started to define my position in the American landscape for myself, which led me to hating Obama and liking Bush. I supported Gingrich in the primary and Romney in the general election in 2012.
In short, I basically never liked an American president when he was actually in office
Hopefully that'll change in 2016.