In a move that has brought ridicule and doubt from a lot of bloggers Ron Paul admitted that he doesn't believe in evolution - A scientific fact - And instead believes in a "creator" - The invisible sky daddy theory.
I have seen very few atheists say they will continue to support Ron Paul after he made public his views on evolution.
But are Atheists right to abandon Ron Paul based solely on his views on evolution? Yes, They are. Simply because someone who claims to be a champion of reason, Evidence and rationality can't help but question the intelligence of someone who believes in biblical creation in the face of overwhelming evidence to the contrary. It would be hypocritical to demand evidence and rationality from everybody except the leader of your country.
The argument has been made by a few atheists that while his views are wacky, It won't effect the decisions he will make as president. While i partially agree, That is irrelevant. A belief in Santa, Elves or pixies wouldn't directly effect the decisions a leader makes either, But it would cast doubt over that individuals ability to think rationally.
If you want to call your self an Atheist and a champion of reason, You can't continue to support Ron Paul. If you want a rational leader, You can't put a creationist in to office.