3 : a field for or pursuit of consecutive progressive achievement especially in public, professional, or business life
Now we need to work around the small P "progressive" here because neither Neumann nor Walker will ever be accused of advocating Progressive policies. In this case it simply means "progressing from one to another."
As so many have pointed out, Walker doesn't really HAVE a field of consecutive achievement as a politician. He's fumbled around in it for 16 of his 42 years on the planet but "achievement" may be stretching the mark. His willingness to play games with his employee's own careers shows just how unfit for service he is.
So maybe we just give in to Young Kyle. After all, he's been to blogger camp and he must know something to be given the prestigious award as best blogger by AFP.