I wish they'd get over to the side of the road. Most of them seem to be riding out in the middle of the lane.
Sometimes there's a reason to be in the center of the lane. If you look at this link, you'll see the most common causes of car/bicycle crashes. The most common explanation given when a bicyclist is hit is "I didn't see him." At times I gravitate to the center of the lane to increase my visibility. I do as I approach and move through intersections. I may as I approach a blind hill or blind bend. This helps mitigate some of vulnerabilities the accompanying link mentions. Most states require bicyclists t stay as far right as practicable. That word is purposefully used rather than possible. Most state's laws go on to discuss times when bicyclists may take center lane. On a narrow road where there's not room for a car to safely overtake a bike completely within lane cyclists may take the full lane. This will often discourage a squeeze pass.
