Watch and wager has announced today that customers using their ADW wagering platform outside of California (excluding Colorado, Maryland, and Pennsylvania) will be able to partake of a 5% takeout on all wagers placed on Cal Expo's races. For those in California, the 5% takeout is limited to Pick-4, Pick-5, and Pick-6 wagers. The only requirement is you bet a minimum of $40 on the weekend's races at Cal Expo. The difference between the normal payoff and the reduced takeout is paid out as a bonus. Complete details are listed here.
If you like playing Cal Expo, here is a reason to try Watch and Wager. Of course, if you are in a state where regulations don't allow participation in this offer or Watch and Wager is not licensed, you are out of luck.
Disclosure: I have not received any compensation from Watch and Wager for this posting. If I find or am made aware of a particularly good offer for harness racing players by ADWs, I will post them.