Tuesday’s Democratic primaries delivered one devastating reality to the campaign of Vermont Sen. Bernie Sanders: His revolution has not materialized.

Again.

Does that mean he should drop out? Not necessarily. Sanders is still drawing votes and winning delegates, still delivering an important message, and still stands a long-shot chance of winning the nomination.

The emphasis there is on “long-shot.”

But it’s clear he does need to take a cold assessment of how this race is likely to play out. Losing Texas, Massachusetts and now Michigan to former Vice President Joe Biden, who enjoys the support of the traditional Democratic base, is problematic to say the least. Especially with the primary contests ahead.

On Tuesday the fight moves to Illinois and Ohio, where the results will likely resemble the Biden blowout in Michigan; Florida, where Biden enjoys a staggering lead in the polls; and Arizona, where Biden also holds a significant lead.

From Sanders’ perspective, the prospect of a zero-for-four showing next week is rather daunting.

His calls for a rising up of young voters have gone unheeded, just as they did four years ago. And the people voting in the Democratic contests this cycle have been consistent.

In New Hampshire, Sanders and fellow progressive Sen. Elizabeth Warren combined for about 35 percent of the vote. Sanders’ support Tuesday in Michigan? About the same — 36 percent. Progressives did a little better in the Iowa caucuses and the South Carolina primary, but Sanders has a ceiling, and he keeps hitting it.

In other words, Democratic voters are speaking. Quite loudly.

If the ultimate goal is to remove President Trump, the longer Sanders hangs in the longer it will take for the Democratic Party to unite behind a single standard-bearer. Given the electoral map, it will take a unified and energized effort to turn toss-up states like Wisconsin, Pennsylvania, Florida and Arizona.

Scott Martelle joined the Los Angeles Times editorial board in 2014.