What do we learn about Atticus chances for winning the case?

From the text:

"Atticus sighed. “I’m simply defending a Negro—his name’s Tom Robinson. He

lives in that little settlement beyond the town dump. He’s a member of

Calpurnia’s church, and Cal knows his family well. She says they’re clean-living

folks. Scout, you aren’t old enough to understand some things yet, but there’s

been some high talk around town to the effect that I shouldn’t do much about

defending this man."

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“Atticus, are we going to win it?”

“No, honey.”

“Then why—”

“Simply because we were licked a hundred years before we started is no reason

for us not to try to win,” Atticus said.

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