She committed to run for the position on January 19 , 2000 .
At the urging of party activists and officials , Cantwell formed an exploratory committee in October 1999 to consider a run for United States Senate against Democrat Deborah Senn and incumbent Republican Slade Gorton .
Cantwell committed to run for the position on January 19 , 2000 .
At the urging of party activists and officials , Cantwell formed an exploratory committee in October 1999 to consider a run for United States Senate against Democrat Deborah Senn and incumbent Republican Slade Gorton .