U.S. Sen. Thad Cochran, R-Miss., addresses supporters and volunteers at his runoff election victory party Tuesday, June 24, 2014, at the Mississippi Children's Museum in Jackson, Miss. Cochran defeated state Sen. Chris McDaniel of Ellisville, in a primary runoff for the GOP nomination for senate. (AP Photo/Rogelio V. Solis)

A press conference call for Sen. Thad Cochran's (R-Miss.) re-election campaign turned into a fiasco on Wednesday when an unidentified caller began asking whether Cochran improperly "harvested" votes from African-Americans like "black people harvesting cotton."

According to several reporters, Austin Barbour, a GOP operative and adviser to Cochran's campaign who was speaking before the interruption, shut down the call after repeated interruptions by the unidentified caller. A shouting match ensued with the remaining callers on the line, and some suggested that either the Cochran campaign had "planted" the question, or perhaps "even Obama" was to blame.

More from reporters on the call:

Cochran press call has turned into a disaster after guy asks why Cochran is "harvesting black votes like black people harvesting cotton" — Brett LoGiurato (@BrettLoGiurato) July 2, 2014

People on the line now suggesting that it was a Cochran campaign plant who ended the call or "maybe Obama" — Ben Jacobs (@Bencjacobs) July 2, 2014

This Cochran conference call has turned into reporters yelling at each other -- mad that call was ended after someone keep interrupting — Alex Pappas (@AlexPappas) July 2, 2014

People still on line saying this was setup by Cochran people for nat'l media to refer to McDaniel people saying blacks were "cottonpickers" — Ben Jacobs (@Bencjacobs) July 2, 2014

On Tuesday, Cochran's campaign denied allegations that he bought black votes in the Senate GOP primary runoff against state Sen. Chris McDaniel, who has yet to concede the race. Charles C. Johnson of GotNews.com posted an interview with the Rev. Stevie Fielder earlier this week in which the reverend claimed he was paid to offer black voters $15 each to vote for Cochran. Fielder was compensated for the interview. A Cochran campaign spokesman called the accusations of illegal vote buying "baseless and false."

Johnson urged his followers to join the call and "crash" it on Wednesday.

But he later denied the insinuation that he was the one to ask the question on the call.