district subject to shift in a year ending in 2 

It's also noted in Paul Ryan entry (Wikipedia) that he's running for re-election in this district while also being the Republican VP nominee.  Since this is a year ending in 2 (also was the case in 1932 when John Nance Garner ran for US House re-election AND as Democratic nominee for VP), the district he's running in is subject to shift from the district he represents, because of reapportionment.