Ever since she voted not to convict President Donald Trump in his Senate impeachment trial, Sen. Joni Ernst (R-IA) has seen her poll numbers plummet, and that could lead to her losing her Senate seat come November when she’s up for reelection.

The Des Moines Register reports that Ernst had an overall approval rating of 57 percent in February, but since her impeachment vote that number has fallen by 10 percentage points, to 47 percent:

“Ernst, a freshman Republican from Red Oak, was the first Iowa woman elected to Congress, defeating Democrat Bruce Braley in 2014. She will be on the ballot in November in a marquee race that could become a key target for Democrats looking to retake the Senate. It has already been the focus of millions of dollars of outside spending.”

The Iowa Republican didn’t exactly come across as being an impartial juror during Trump’s impeachment, telling reporters shortly before the full Senate voted not to convict the president that she wondered how revelations about former Vice President Joe Biden’s son, Hunter, would impact Biden’s performance in the Democratic presidential primaries:

“Iowa caucuses are this next Monday evening. And I’m really interested to see how this discussion today informs and influences the Iowa caucus voters, those Democratic caucus goers. Will they be supporting VP Biden at this point? Not sure about that.”

Beating Ernst in a state as conservative as Iowa won’t be easy, and the same poll that shows her numbers slipping also has this sobering reminder: 41 percent of likely Iowa voters say they would definitely vote to reelect Ernst if the election were held today.

But with the U.S. economy starting to show signs of a recession caused in part by the coronovirus outbreak, both Ernst and Trump — along with other incumbent Republicans — could well be facing an dissatisfied electorate when ballots are cast later this year.

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