Poll: Most Iowa voters want Sen. Chuck Grassley out

• But Iowa's reliably red seat now appears "vincible," Selzer said.

By the numbers: 64% of likely voters said they believe someone new should hold Grassley's seat.

• 37% of those are Republicans, 89% Democrats and 68% are independents.

Yes, but: If Grassley decides to run again, he will still hold a strong advantage over any competitor because of his name recognition and long incumbency.

• 27% of likely voters said they would reelect Grassley — the majority (51%) of whom are Republicans.

Between the lines: Though the 87-year-old senator is a household name, there's growing sentiment that Iowa's longest-serving has been in office long enough.

What they're saying: "He still does care about the people and the farmers," Dawn Leiser, a 46-year-old independent, told the Register. "It's just that we need to get fresher and newer blood unfortunately."

Methodology: 630 likely voters were polled about the 2022 midterm elections from June 13-16. The poll's margin of error is plus or minus 3.9 percentage points.