Rick Santorum has lost four straight contests, but you can't tell it from his attitude.

The perpetually optimistic candidate has been drawing standing-room-only crowds and promising his political fortunes will improve if he can make it to just one more state.

On Sunday, he said the upcoming races in Minnesota, Missouri and Colorado could be chances for him to reset the race a line he has used ahead of each of the last four races where he came up short.

On Saturday, Santorum came in last place in Nevada.

He didn't mention that latest setback when he attended church services Sunday, and showed no sign the GOP contest was sliding through his fingers as he toured the factory that produces the sweater vests he sells as a fundraiser.