I'm with LPH, though for a slightly different reason. Take more of the lane if you want to avoid incidents like this. If you hug the right and leave enough room for a car to squeak by without moving over, invariably someone will do it.... I think that 99% of them are not being malicious. They just have no idea how wide their car is and how wide a cyclist is.

If you take about 1/3 of the road way (ride in the right hand wheel rut...) then when people pass most of them automatically move over and give you more room. It's almost like the lane dividers are a psychological barrier. If they don't have to cross it they won't. If they do have to cross, they generally go all the way over.