Bit the Jackpot, by Erin McCarthy
Second in the Vegas Vamps series by Erin McCarthy...
I'm not going to rehash my romance issues from the first book, just assume that everything I said there is still true. I'm just going to do a little plot business...
This one is more about Seamus the campaign manager and the woman he turns near the beginning of the book. They do finally figure out what's going on with someone trying to kill Mr. Pres so that gets dealt with.
And that's all I have to say about that!
edited August 2008 to add: This falls under example 1 in the Romance Disclaimer