It is no use defining a good presidential candidate because there is no perfect recipe. Conservatives want an honest candidate and the liberals would prefer devious and dishonest. A conservative would want someone that is not going to spend us into debt, and the liberal perfers to play now and pay later....preferably when their kids can pay it back for them, or steal the money from those that are better than them to pay their way. A conservative will be morally and ethically motivated, whereas a liberal is free from such restrictions. A conservative will be loyal to the people and those that serve us, and the liberal will challenge every motive of anyone that doesn't conform to their standards, preferring others to fight their battles for them and to protect them.

So, all the traits that conservatives prefer are just restrictions and negatives to a liberal.