An expensive, personal, very close presidential race careens toward an uncertain end

Six months from Election Day, American voters are confronting a presidential race that looks stable at a glance — and is roiling with uncertainty beneath the surface.

For the first time in more than a century, Americans will choose between two presumptive major-party nominees who have already served as commander-in-chief: President Joe Biden and former President Donald Trump.

But while the matchup has long been expected, Americans are sour about it: Election interest hit a 20-year low in the latest NBC News poll, and majorities of registered voters have unfavorable views of...