The McCain campaign has apparently decided to spread the notion among Evangelicals that Barack Obama is the Antichrist.
Michael Froomkin: New Low For McCain Campaign: Obama == The Anti-Christ
SoonerG says: McCain's Left Behind Attack
Snoopes has more: Obama as Anti-Christ
This is typical for the McCain campaign. Dog-whistle politics is a common tactic by Rove and Lee Atwater. It's in play now right before your eyes and this time it's targeted at evangelicals.
Dog-whistle politics, also known as the use of code words, is a type of political campaigning or speechmaking employing coded language that appears to mean one thing to the general population but has a different or more specific meaning for a targeted subgroup of the audience. The term is usually used pejoratively by those that do not approve of the tactics.