ALBANY — The 21st Congressional District field continues to grow as the calendar changes to 2018.

Democrat Sara Idleman, the Greenwich town supervisor, filed paperwork with the Federal Election Commission on Monday to challenge U.S. Rep. Elise Stefanik, R-Essex County, making her the eighth Democrat to enter the race.

Idleman will officially announce her candidacy at an event on Saturday, she said in a brief interview. She said she did not want to upstage that event but added that a run for Congress has been on her mind for some time.

"I think we need to get someone in office who is really familiar with and concerned about and aware of what the constituents need in the 21st Congressional District," she said.

Democrats Patrick Nelson of Stillwater, Donald Boyajian of Cambridge, Ronald Kim of Queensbury, Tanya Boone of Granville, Emily Martz of Saranac Lake, Katie Wilson of Keene and Tedra Cobb of St. Lawrence County all are seeking to oust Stefanik, a two-term congresswoman first elected in 2014.

Republicans Russell Finley of St. Lawrence County and Steven Schnibbe of Saranac Lake are seeking to primary Stefanik.

The 21st district runs from Lake Ontario to Lake Champlain and from the Canadian border south into parts or all of Saratoga, Warren, Washington and Fulton counties.

mhamilton@timesunion.com • 518-454-5449 •@matt_hamilton10