Maybe...
Here are some maybes. Maybe the president has simply concluded he has no more elections to face and no longer needs his own troops to wage the ground war and contribute money. Maybe with no more elections to face he's indulging a desire to show them who's boss. Maybe he has concluded he has a deep and unwavering strain of support within the party that, come what may, will stick with him no matter what. Maybe he isn't all that conservative a fellow, or at least all that conservative in the old, usual ways, and has been waiting for someone to notice. Maybe he has decided the era of hoping for small government is over. Maybe he is a big-government Republican who has a shrewder and more deeply informed sense of the right than his father did, but who ultimately sees the right not as a thing he is of but a thing he must appease, defy, please or manipulate. Maybe after five years he is fully revealing himself. Maybe he is unveiling a new path that he has not fully articulated--he'll call the shots from his gut and leave the commentary to the eggheads. Maybe he's totally blowing it with his base, and in so doing endangering the present meaning and future prospects of his party.
Hey Peggy, I've got one you forgot to add: Maybe Ms. Miers is a smart, conservative cookie and she'll make a great Justice.