In corruption cases, the potential for partisan shenanigans may arise in two different ways, each of which disserves the interests of justice. First, partisan prosecutors might ignore credible allegations of corruption because they fear embarrassing their political party or patron. Second, partisan prosecutors might pursue flimsy allegations for political purposes.As Dan Froomkin says in White House Watch
Here in Illinois, we recently had the unfortunate example of the secretary of state's inspector general reminding investigators that their job was to protect their political boss, not to find and resolve internal corruption.
It's worth noting that federal prosecutors rarely write op-eds. Presumably, in this case, Collins didn't think he'd get in trouble for doing so. And who's his boss? A fellow named Patrick J. Fitzgerald.