Singer, actor and writer Pat Boone was hailed (by the conservatives) as the conservative alternative to Elvis Presley back in the 50s. Currently, he is a political commentator, Christian activist and preacher, and a columnist for the fringeloon magazine WorldnetDaily. He is an ardent young earth creationist and has had several stabs at disproving evolution, such as this one; he uses the tried and dishonest “it’s only a theory”, “there is no evidence”, “Darwin recanted on the deathbed” fallacious arguments from authority (his authorities are uniformly preachers and Boone praises their credentials as award-winning missionaries and staunch Biblical literalists) + some novel ones I have, for obvious reasons, never seen before. Another attempt is discussed here (updated here). Boone later wrote an editorial in the form of a fairy tale where a young Prince Charming was seduced by a dwarf, got AIDS, and then overdosed.
Apart from anti-evolution, his columns are filled with the standard delusional moron stuff – Christians are a persecuted (particularly by the ACLU) minority in the US (discussed here and here), defense of torture (discussed here - the ignorance and dishonesty is astounding, even for a wingnut) and similar stuff.
He got attention for the claim that Democrats and others who were against the president during the Iraq War could be questioned for their patriotism – under an interview on this, he expressed his outrage against the opponents of George W. Bush (namely the Dixie Chicks) that their criticisms of the president showed they did not "respect their elders". He also vigorously defended Mel Gibson after the actor was recorded making an antisemitic rant.
He is also a vocal opponent of gay rights, and won some fame for his tasteful comparison between equal rights activists and the terrorist attacks in Mumbai (Boone apparently thinks that the “homosexual jihadists” should be sent to concentration camps because they are anti-freedom, or something like that); discussed here and here.
He is also a birfer (i.e. Obama is not a natural born citizen, but a Kenya-born Muslim, and hence not eligible for being a president).
Diagnosis: Complete moron; hateful, dishonest, zealous bigot and loon. Impact uncertain, but he is probably read by a lot of people who are initially sympathetic to his views – whether he comes across as spurring them onwards into wingnuttery or helping them come to their senses by displaying purefied idiocy is unclear.