(Portland, OR)  --  Police in Clackamas County say four people died from carbon monoxide poisoning during the weekend's winter storms.  The Clackamas County Sheriff's Office confirmed the deaths yesterday.  Police aren't releasing details yet on where the deaths occurred.  The Oregon Poison Center says it received 19 calls for carbon monoxide exposure over the holiday weekend.  Authorities are reminding residents you should never use kerosene or gas space heaters, a natural gas range or a camp stove to heat your home and should never run a generator indoors.