House Speaker John Boehner is pressing ahead with a vote this week on whether to hold the government's top attorney in contempt of Congress, a move the White House warned Tuesday is a confrontational political ploy. But Democrats may be signing up. On Tuesday, the chief Democratic House head counter, Rep. Steny Hoyer of Maryland, declined to tell reporters how many defections he expected, but acknowledged that some in his party would consider heeding the NRA’s call for a “yes” vote. Attorney General Eric Holder faces a historic censure by the House should a contempt resolution be brought to the...