FROM THE BLOGS:
Gun Owners of America leader: liberals pleased with Boston bombing
The Huffington Post's Nick Wing writes about the claims made by the head of a gun rights group that's to the right of the NRA.
Elizabeth Colbert-Busch's lead over Mark Sanford grows in South Carolina special election
David Nir of the Daily Kos explains how the sister of a famed comedian was able to move up in the polls against the former Governor of South Carolina.
Two brief thoughts on Boston
Peggy Noonan writes in the Wall Street Journal that the recent Boston bombings could impede on the potential for any immigration reform bill to pass in Congress.
Senator Toomey vs. the NRA
The National Review's Eliana Johnson writes that NRA leadership believes Sen. Pat Toomey (R-Penn.) will regret trying to get bipartisan gun control legislation passed through the Senate.
OTHER NEWS SOURCES:
Cornyn: Gang of Eight immigration bill undermines border security
Sen. John Cornyn (R-Texas) is concerned that the bipartisan immigration bill focuses on improving border security for only a few checkpoints and says there is not a concrete plan for tracking visas exiting the country, The Hill's Alexander Bolton reports.
Obamas to attend service for victims of Texas explosion
The President and First Lady will attend the memorial service at Baylor University in addition to the dedication of President George W. Bush's presidential library, The Hill's Justin Sink reports.