Today's installment of campaign-related news items from across the country.
* Rep. Jim Clyburn, the most prominent Democratic official in South Carolina, is throwing his support to Hillary Clinton.
* On a related note, three new polls were released overnight showing Clinton leading Bernie Sanders by margins ranging from 21 to 28 points.
* In national polling, however, Clinton leads Sanders in a new NBC News/Wall Street Journal poll by 11 points, 53% to 42%, while Sanders leads Clinton in a new Fox News poll by 3 points, 47% to 44%. The latter is the only poll taken this cycle that shows Clinton falling into second place.
* As the Republican establishment moves with increasing speed to support Marco Rubio, Sen. Pat Roberts (R-Kan.) threw his endorsement to the Florida senator late yesterday.
* Speaking of Rubio, the senator had agreed to participate in a conservative event in Greenville, S.C., last night, featuring right-wing radio host Mark Levin, but Rubio abruptly canceled, citing scheduling difficulties. The fact that much of the crowd was made up of Ted Cruz supporters might have had something to do with it.
* Jeb Bush says he doesn't want President Obama to nominate a Supreme Court justice, but if he were president facing the same circumstances, he "probably would" send a nominee to the Senate for consideration.
* Ted Cruz's closing message in South Carolina leans pretty heavily on praise from Rush Limbaugh, who compared the Texas senator to Ronald Reagan. Cruz also unveiled this week a surprisingly effective attack ad against Rubio on immigration.
* It may not amount to much, but the editorial board of The State newspaper in Columbia, S.C., endorsed John Kasich's campaign this week.