Former Florida governor Jeb Bush’s political stock has fallen sharply over the past few months. The debate now taking place among Republicans is whether that stock is undervalued or a fair reading of the current shape of his campaign. The latest quarterly financial reports brought new questions for the candidate who began the campaign with assets none of his rivals could match. He raised barely more in the third quarter than he did in the second — even though his second-quarter fundraising amounted to just 16 days of activity. His average daily fundraising dropped sharply from one quarter to the...