(Vancouver, WA)  --  Organizers estimate about 55-hundred people cheered on Democratic presidential candidate Bernie Sanders as he made a campaign stop in Vancouver.  The Vermont senator's appearance at the jam-packed gymnasium at Hudson's Bay High School yesterday was one of three stops he made in Washington ahead of the state's Democratic caucuses.  Sanders is trailing Democratic opponent Hillary Clinton in the delegate count, but believes he'll gain strong momentum in Washington and other Western states.  Sanders also made appearances yesterday in Seattle and Spokane.