Republican Sen. David Vitter of Louisiana is determined to force his fellow senators to do something many don't want to do: Vote on whether the law, specifically Obamacare, applies to members of Congress and their staff.Back in 2009, when Democrats were writing the massive new national health care scheme, Iowa Republican Sen. Chuck Grassley offered an amendment. Obamacare created exchanges through which millions of Americans would purchase "affordable" health coverage. Grassley's amendment simply required lawmakers, staff, and some in the executive branch to get their insurance through the exchanges, too.To every Republican's amazement, Democrats accepted the amendment.