Voters turn out for South Carolina primary

Jan. 21, 2012: Thomas Pounds of Anderson, S.C., checks in to vote in the South Carolina Republican primary with poll manager Mae Kellam, right, at the Anderson Recreation Center in Anderson. (AP/Anderson Independent-Mail, S.C.)

Jan. 21, 2012: Poll manager Pinkie Cowans of Anderson, S.C., inspects an electronic voting booth for the South Carolina Republican primary at the Anderson Recreation Center in Anderson, S.C.  (AP/Anderson Independent-Mail, S.C.)

Jan. 21, 2012: Republican presidential candidate and former House Speaker Newt Gingrich takes part in a TV interview during a campaign event at the Grapevine Restaurant in Spartanburg, S.C. (AP)

Jan. 21, 2012: South Carolinians vote in the South Carolina Republican presidential primary at the Amicks Ferry Fire Station in Chapin, S.C. (AP)

Jan. 20, 2012: Republican presidential candidate Rep. Ron Paul, R-Texas is seen on stage greeting supporters during a campaign rally in Columbia, S.C. (AP)

Jan. 21, 2012: South Carolinians arrive to vote in the South Carolina Republican presidential primary at the Amicks Ferry Fire Station in Chapin, S.C. (AP)

Jan. 21, 2012: "I voted stickers" await South Carolina voters for the Republican presidential primary at Amicks Ferry Fire Station in Chapin, S.C. (AP)

Jan. 20, 2012: Republican presidential candidate, former Pennsylvania Sen. Rick Santorum speaks at Captain Steve's Restaurant in Fort Mill, S.C. (AP)

Jan. 21, 2012: South Carolina voters wait in line to vote in the South Carolina Republican presidential primary at the Amicks Ferry Fire Station in Chapin, S.C. (AP)

Jan 21, 2012: Republican presidential candidate, former Massachusetts Gov. Mitt Romney campaigns at Tommy's Country Ham House in Greenville, S.C., on South Carolina's Republican primary election day.  (AP)

Jan. 21, 2012: Poll manager Marguerite McClam, right, checks voter identification as South Carolinians arrive to vote in the Republican presidential primary at the Amicks Ferry Fire Station in Chapin, S.C. (AP)