The November 7, 2006 elections resulted in an unprecedented 24–24 tie in the number of seats held by Oklahoma's two major political parties, the Republican Party and the Democratic Party. Although the Republican Party added two seats to their prior total, they had lost a seat in July due to Nancy Riley changing in her party affiliation from Republican to Democratic. The Democratic Party did hold the seat of lieutenant governor, who also serves as President of the Senate, giving them a tie-breaking vote in the Senate.