House Democrats needed a big showing from their public impeachment hearings to rally public opinion and build a consensus for Donald Trump’s removal. After the first few days of testimony under Adam Schiff’s direction, they find themselves losing ground instead. In the latest Politico-Morning Consult poll, opposition to impeachment and removal has hit a recent high, and independents are bailing out on the project: The survey, which has tracked support and opposition for the inquiry each week, support for the investigation inched down 2 points — to 48 percent from 50 percent — while opposition to the inquiry ticked...