Political activist Doris “Granny D” Haddock, who at the age of 94 challenged Sen. Judd Gregg (R-N.H.) and won 34 percent of the vote in 2004, died Tuesday at her home in Dublin, N.H., the Keene Sentinel reported.

Haddock was perhaps best known for walking across the country, at the age of 90, in support of the McCain-Feingold campaign finance reform bill in 2000. She became a familiar presence on Capitol Hill during the push for that legislation.

Haddock continued to make public appearances and to rally for issues such as campaign finance reform until she was overtaken by chronic respiratory problems several days ago, Seacoast Online reported.

Democratic Rep. Paul Hodes, who is seeking the seat Gregg is vacating at the end of this term, said in a statement: “Doris ‘Granny D’ Haddock was eloquent, funny, powerful — and one of a kind. She was an indeterminable advocate for real reform, a gutsy voice for those who had lost theirs and a constant reminder to all of us of the very best in New Hampshire and in our political process. New Hampshire lost a hero tonight, and while Granny D will be truly missed, she will never be forgotten.”