Beau Biden

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** FILE ** Delaware Attorney General Beau Biden, right, takes a walk with his father,Vice President Joe Biden, to the Green Ridge Little Baseball Field in Scranton, Pa, July 4, 2012. Beau Biden is being evaluated at a cancer center in Texas, according to people with knowledge of his condition. (AP Photo/The Scranton Times-Tribune, Butch Comegys)

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Vice President Joseph R. Biden — accompanied by his son Beau Biden; Beau's wife, Hallie; and their daughter, Natalie — stands in line to cast his ballot at Alexis I. duPont High School on Tuesday, Nov. 6, 2012, in Greenville, Del. (AP Photo/Matt Rourke)

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Jill Biden, center, wife of Vice President Joe Biden, sits with her sons Beau Biden, left, and Hunter Biden, right, before the start of the vice presidential debate, at Centre College in Danville, Ky. (AP Photo/Pablo Martinez Monsivais)

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Vice President Joe Biden acknowledges his son Beau Biden, Attorney General of Delaware who placed his father's name in nomination for Vice President on the night that President Barack Obama accepts his party's nomination for a second term as President of the United States at the Democratic National Convention in the Time Warner Cable Arena in Charlotte, N.C., on Thursday, September 6, 2012. (Barbara Salisbury/ The Washington Times)

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ASSOCIATED PRESS Delaware Attorney General Beau Biden discusses his re-election campaign in Dover, Del., last week. When asked about his long-range plans, specifically about whether he is eyeing the U.S. Senate seat long held by his father, the eldest son of Vice President Joseph R. Biden Jr. remains coy.