Conversation so far:
Did Tim Kaine run for Governor?
Kaine ran for governor.
In which state?
Virginia.
Did he win?
Kaine ultimately prevailed, winning.
Who did he run against?
Jerry W.
Kilgore.
Was Kilgore a Republican?
Republican.
Was there anybody else in the race?
A third candidate--independent state Senator H.
Russell Potts Jr..
What was the race like?
sharply negative in its final weeks.
How was it negative?
Kilgore running television attack ads that claimed, incorrectly, that Kaine believed that "Hitler doesn't qualify for the death penalty..
What else was nasty about the campaign?
attacked Kaine for his service ten years earlier as a court-appointed attorney for a death-row inmate.
Did Kaine have any response to these attack ads?
responded with an ad "in which he told voters that he opposes capital punishment but would take an oath and enforce the death penalty.
Did Kaine make any campaign promises?
He expressed support for controlling sprawl and tackling longstanding traffic issues.

Question: Why was he concerned about that?
Self-contained rewrite: Why was Tim Kaine concerned about controlling sprawl and tackling longstanding traffic issues?