Now that Donald Trump has won three primaries by convincing margins, there are at least some cracks in the wall of opposition to his candidacy within some segments of the Republican Party establishment. As Trump racks up delegates and makes it more difficult for the four remaining challengers to catch him in the race for delegates, some major GOP donors are questioning the purpose and efficacy of efforts to derail Trump’s candidacy. Bob Grand, managing partner of Barnes & Thornburg in Indianapolis, was a financial supporter and bundler for former Florida Gov. Jeb Bush. He hasn’t yet decided if he’s...