The survey, six weeks before Americans head to the polls, shows Democrats leading Republicans by 52 percent to 40 percent for control of Congress. If it holds, that 12 percentage point margin would suggest a “blue wave” large enough to switch control of not just the House but also the Senate.

“The results could not be clearer about making a change in direction from Trump’s policies,” explained Bill McInturff, the Republican pollster who helps conduct the NBC/WSJ survey. “Once again, Americans are hitting the brakes in a mid-term.”