Rep. Mark Sanford, R-S.C., was ceremonially sworn into office today by House Speaker John Boehner, following a formal swearing-in on the House floor. During the ceremony, he was flanked by his family and his fiancee, Maria Belen Chapur, with whom he once carried on an extramarital affair.

The IRS targeting of conservative groups during the 2012 is "a clear breach of the public’s trust," said Senate Finance Committee chair Max Baucus, promising, "I intend to get to the bottom of what happened here – the Inspector General’s report is just the beginning and the Senate Finance Committee…has just begun what will be a thorough investigation."

The White House released internal e-mails that deal with the administration’s public description of the attack on the U.S. Consulate in Benghazi, Libya. Major Garrett reports.

Cicadas, after living underground on the East Coast for 17 years, are about to re-surface. They will be making plenty of noise — and love. Jim Axelrod meets with some pre-schoolers in Short Hills, N.J., who get their first glimpse at one of the marvels of nature.

Investigators have discovered that Boston bombing suspect Dzhokhar Tsarnaev left a note inside the boat as he was hiding in it, claiming responsibility for the bombings. CBS News senior correspondent John Miller discusses the contents of the note and what it means to the case.

CBS News Special Report: President Obama announces his administration has accepted the resignation of acting IRS Commissioner Steven Miller, following the agency’s admission that its agents targeted conservative political groups when they applied for tax exempt status. Scott Pelley reports.

Attorney General Eric Holder said IRS specialists may have violated a variety of laws when they singled out conservative groups for special scrutiny, starting in 2010. Nancy Cordes reports on how the actions of the agency have outraged members of Congress.

An Atlas 5 rocket boosted a new GPS satellite into space, the latest in a series of upgraded navigation beacons with improved accuracy and longevity.

While the head of one left-leaning group says the process of applying for an IRS tax exemption was too long, it was much easier for him than it was for Tea Party groups. Wyatt Andrews reports.

Tradition and old-fashioned romance are returning to weddings, according to TheKnot.com’s Rebecca Dolgin. She shares five of the year’s hottest trends.