Lynch introduced and was behind the indictment of Michael Grimm. I think that could lead to problems with Republicans.
Wow, Grimm won? And why was he endorsed by a ton of unions? Obama has this habit sometimes of using his power to dampen a victory for the opposition- for example, soon after North Carolina voted to ban gay marriage in 2012, he came out in favor of it. It worked, as all the momentum the referendum proponents got out of the event quickly evaporated and reversed.
Grimm's victory must have been a massive F.U. to the Justice Department, and I wonder if part of Obama's calculation in this nomination was to boost the morale of the prosecuting team (and by extension, the Department).