President Donald Trump's late campaign blitz targeting immigrants has rallied the Republican base of white working-class voters, helping to curb the Democratic advantage heading into Tuesday's midterm elections for Congress. The election-eve NBC News/Wall Street Journal poll shows Democrats leading by seven percentage points, 50 percent to 43 percent, among likely voters. That's down from a nine-percentage point lead last month. That slightly narrowing reflects rising interest in the election from the foundation of Trump's support: White men, especially older, less educated, less affluent ones in small towns and rural areas. Most noteworthy for a mid-term election, the 2018 campaign...