Polls became something of a linchpin of Donald J. Trump’s successful campaign for the presidency.

He boasted about them continually when they showed him leading his Republican Party primary rivals. He ridiculed other GOP candidates for failing to break the 1 or 2 percent barrier.

Then he got nominated and he started bragging as the general election campaign raced toward the finish line and polls showed him closing the gap with Hillary Rodham Clinton.

Polls are up? They’re good. Polls go down? They’re “rigged.”

Well, the president-elect has some more polling data with which to contend. These are the polls that show Trump to be about the least popular president-elect in decades.

Barack Obama became president with an approval rating at nearly 80 percent. George W. Bush took office in 2001 also with soaring public approval ratings.

Trump’s ratings? They’re at 40 percent or less, depending on the polls you see.

Think of this, too: The president-elect hasn’t done anything! He’s made no difficult decisions that are bound to anger millions of Americans.

Transitions historically have been the high-water mark for presidents of the United States. The next president starts at a much lower platform than most of his predecessors.

What about these polls, Mr. President-elect?