BYRON YORK: Centrist voters cut Biden out of the picture.

“You think Biden is losing support by the hour?” I asked an experienced New Hampshire politico as he arrived to check out the Pete Buttigieg rally here in the southeastern part of the state Sunday afternoon.

“By the minute,” he said.

Nearly one-third of voters here remain undecided just hours before Tuesday’s primary. That certainly appeared to be true of many in the Buttigieg crowd. But being undecided does not mean a voter is open to any candidate. And that looks like more bad news for Biden.

In this way: By and large, the people who attended the Buttigieg rally saw themselves on the centrist side of the Democratic electorate. Of course, they would vote for any Democrat over President Trump, but in Tuesday’s primary, they tend to stay away from the two leading candidates farthest to the left, Sens. Bernie Sanders of Vermont and Elizabeth Warren of Massachusetts.

The conventional wisdom says that would leave them with three choices among the candidates with a plausible chance to do well: Biden, Buttigieg, and Minnesota Sen. Amy Klobuchar. The problem for Biden is that many of the centrists seem to have already squeezed him out of the picture.

“I don’t like Bernie and I don’t like Elizabeth Warren,” said Ann Cudlip of Brentwood. “They’re too far Left for me. I need center, and I need somebody who can defeat Trump. That’s my thing.”

“Who does that leave you with?”

“Amy and Pete,” she said, explaining that she now gives Buttigieg the edge because of his performance in the Iowa caucuses.

Buttigieg is no moderate.