ATTLEBORO, Mass. — Charlie Adler was watching a Ken Burns documentary the other night about an American couple who went to Europe during the 1930s and ’40s to help save Jews from the Nazis.

It got him thinking about presidential candidate Donald Trump and the upcoming election.

Not that the liberal Attleboro activist is comparing Trump to Hitler, but he said he is concerned about what could happen to America if Trump is elected.

“I’m worried about Trump, and how he could destabilize our country. He could push it over the tipping point to social disorder,” Adler said.

Rather than just complain, he decided to do something.

Adler went to Boston and Providence, and held up a sign pleading with people not to vote for Trump.

Then, after getting the approval of his wife Barbara Clark and his children, he decided to take the cause a lot farther, and hit the road to visit the capital city in every state except Alaska and Hawaii.

Adler, well-known for his involvement in social justice and environment causes in Attleboro, is retired, so he said he has free time to make the trips.

He has 48 days to visit 48 states with his sign reading: “For our country’s sake, don’t hire this man.”

The New England states were the first on the list for the former Attleboro city councilor. Then, it was off to Albany, N.Y., and Harrisburg, Pa.

Recently, he spoke by phone to The Sun Chronicle from in front of the statehouse in Charleston, West Virginia.

As he was speaking, people would pass him and give a thumbs up or down, or maybe shout a word of encouragement or an expression of disapproval.

Adler said no one has been rude to him, so far, but some Trump supporters have made it known they disagree.

He said he tries to engage with them to find out why they support Trump.

One man he met in Harrisburg was really torn.

A life-long Republican, he told Adler he cannot bring himself to vote for Trump. But, every time he starts to reconcile himself to supporting Hillary Clinton, something happens to change his mind.

Adler got the man’s contact information, so he can find out how he ends up voting.

Next on his road tour are Columbus, Ohio; Lansing, Mich.; Frankfort, Ky.; and Nashville, Tenn. Then, he’ll head to the West Coast and return by way of the South.

Adler has set up a Facebook page titled “48 States in 48 Days” to record his adventure, and as of Thursday afternoon it had 190 likes.

The comments so far have been encouraging.

“Good for you Charlie. I’m with you all the way,” wrote Lawrence DeJong.

“Go, Go, Go,” wrote Janet Wood.

Cynthia Fielder wrote: “Got to love the American way. Go Charlie.”

Information from: The (Attleboro, Mass.) Sun Chronicle,