The mayoral race in Bensburg is a choice between Chu, a prodevelopment candidate, and Lewis, who favors placing greater limits on development.
Conclusion (Thus)
Chu will probably defeat Lewis.
Evidence
The election is between Chu and Lewis.
Chu is a prodevelopment candidate, whereas Lewis favors placing limits on development.
Prodevelopment candidates have won in the last six mayoral elections.
Evaluate
Given that ... prodevelopment candidates have won the last six elections and that ... Chu is more pro-development than Lewis
How could we argue that ... Chu will probably not defeat Lewis?
Maybe there's something super toxic about Chu that outweighs the positive that he's more prodevelopment than Lewis.
Maybe something has changed in this election cycle that would make the electorate less likely to vote for a prodevelopment candidate. The argument is assuming, , failing to consider that maybe Past ≠ Present.
Maybe it's a total coincidence that the last six winners were prodevelopment. Maybe they won in spite of being pro-development, not because of it.
Goal
Find any answer that would allow us to diminish the author's evidence or to argue that Chu is not likely to win this election.