Conversation so far:
When did Jeanine Pirro seek office?
On August 10, 2005, Pirro announced she would seek the Republican nomination to challenge incumbent senator Hillary Clinton, a Democrat, in the 2006 election for U.S. Senator from New York.
What office was Jeanine Pirro in the 2006 election?
U.S. Senator from New York

Question: Who did she run against on the republican side?
Self-contained rewrite: Who did Jeanine Pirro run against on the republican side in the 2006 election for U.S. Senator from New York?