Blood Oath by Christopher Farnsworth

The book trailer is becoming very popular these days. Here is the most interesting trailer I have seen in a while.

Christopher Farnsworth's Blood Oath The first book in The President's Vampire series

Zach Barrows is an ambitious young White House staffer whose career takes an unexpected turn when he's partnered with Nathaniel Cade, a secret agent sworn to protect the President. But Cade is no ordinary civil servant. Bound by a special blood oath, he is a vampire. Cade battles nightmares before they can break into the daylight world of the American dream, enemies far stranger-and far more dangerous-than civilians have ever imagined.

Blood Oath is the first in a series of novels featuring Nathaniel Cade-the President's vampire.