WASHINGTON: Viewers watching on television as politicians and guests arrived for the State of the Union address may have been wondering: What happened to Jill Bidenís arm?

The wife of Vice President Joe Biden arrived in the House chamber Tuesday night sporting a purple cast. It was the first time she had been spotted in public wearing the cast.

The vice presidentís office says the second lady broke her left wrist last week after slipping and falling. Sheís expecting to be wearing a cast for about six weeks.

Bidenís office says the icy weather blanketing much of the U.S. wasnít the culprit in the fall.

In addition to her duties as second lady, Biden teaches at a Washington area community college. Sheís also an advocate for military families.