Wal-Mart ( WMT) was also on the upside, tacking on 1.1% to $51.45, following word it plans a new $15 billion buyback. As for Merck ( MRK), it wasn't as fortunate, down 1.9% to $26.08 on word that a heart failure drug fell short of its targets in a clinical study. Meanwhile, lame duck component GM ( GMGMQ) was at 83 cents on the pink sheets. Its official exit will come Monday, remember, when it will be replaced with Cisco ( CSCO). Since Tuesday though, we've basically had the Dow 29. Speaking of GM, here's a candidate for head-scratcher of the day. The Wall Street Journal says that GM will help finance the buyout of auto-parts company Delphi ( DPHIQ). The bankrupt leading the bankrupt? According to this report, GM will put up more than $2.5 billion of the $3.6 billion needed for Platinum Equity to take over Delphi and this was "incorporated into GM's revised viability plan." Why not?