Blood Oath by Christopher Farnsworth

This book, first in a series, introduces us to the president's vampire, Nathaniel Cade, just as he gets a new liaison with the White House, an ambitious young staffer named Zach Barrows. They're immediately called to duty as a group of terrorists, working with the man known to popular culture as Frankenstein (who, obviously, has discovered the secret to immortal life), conspires to attack the president with Zombies. There's also an out-of-control secret government agency that clogs up the works, and an early cameo by a pack of werewolves. I found the plot intriguing, but not particularly deft, and the writing acceptable. I'll probably read the other books as they come out, as a form of relaxation, but this is definitely the type of book that you can get from the library or wait for the paperback.