Graham, 64, faces fellow Republicans Duke Buckner, Michael Lapierre and Joe Reynolds. Buckner, an attorney and former Walterboro city councilman, and Lapierre, a retired corporate executive from Pickens, have argued Graham isn't conservative enough. A year ago, all of South Carolina's statewide-elected officials endorsed Graham, as has Vice President Mike Pence, who helped kick off Graham's campaign last year. The 44-year-old Harrison, an associate chairman with the Democratic National Committee and former chairman of the South Carolina Democratic Party, has from the start aimed to draw national attention. Graham has taken in a total of $21 million, according to Federal Election Commission records.