GUTHRIE CENTER, Iowa (AP) — Rep. Cindy Axne happily talked about trade, health care and agriculture with about three dozen constituents who gathered in a farm bureau office the weekend before Christmas. Missing from the Iowa Democrat's talking points: her recent vote to impeach President Donald Trump.

Over the course of an hour, the issue that most clearly represents Washington's Trump-era polarization came up just once. And even then, it was from a questioner who thanked Axne for supporting the two articles that cleared the House last week in a party-line vote.

Axne seemed a little surprised...