WATERLOO, Iowa -- Rick Perry's events have taken a turn for the crowded. He'll arrive, typically, to find that a coffee shop built to accommodate 75 people is crammed with up to twice that many, spilling out the door and jammed into every available corner. The crowds are excited, too. They'll murmur "mmm-hmms" and exclaim "yeahs!" as he winds through his stump speech, breaking into loud applause when he calls for a balanced budget amendment, a part-time Congress and the end of Obamacare. Despite the excitement and enthusiasm, though, the Texas governor remains very firmly stuck in the middle of...