In an indication that he expects to be Barack Obama's vice-presidential pick, Sen. Joseph Biden (D-Del) has begun writing a 50,000-word acceptance speech, aides to the senator confirmed today. The address, which Mr. Biden has been working on around the clock, is an abridged version of a 200,000-word acceptance speech that Mr. Biden wrote when he ran for President in 1988. According to those familiar with the speech, if Mr. Biden is tapped as Mr. Obama's vice presidential choice the Delaware senator would begin delivering the speech on Wednesday night of the Democratic convention and conclude it on Thursday night....