Elise Stefanik has received support from the Republican committees from all 12 counties in the 21st congressional district.
Stefanik is seeking her second term this year.
The Republican will face one of several Democrats from an ever-changing field of candidates.
Nearly a dozen had declared their candidacies, but several have dropped out since former cable news host Dylan Ratigan announced he would run.
The remaining Democrats will face off in a primary on June 26. The winner will face off against Stefanik in November.