LANSING (WKZO) -- Republican presidential candidate Rick Santorum wants an investigation into how Michigan's delegates from last week's primary are being split up.  Michigan Republican Party Chairman Robert Schostak says the confusion is his fault, saying he did not clearly communicate the decision to give the winner two additional delegates.  Mitt Romney beat Santorum by three-percent, but the campaign of the former U.S. senator from Pennsylvania is still demanding the same number of delegates as Romney.