What few patrol officers are out during rush hour in the Twin Cities are all busy with accidents. There is very little enforcement during peak rush hour and is literally a free for all.Blocking the intersection is illegal in CA and the violator can be cited. The law states that the intersection must be cleared when the light changes to red. Many people have been cited for entering the intersection to make a left turn and waiting until the light turns red to complete the turn. Can't speak for any other state, but I know it to be true in CA.
At this point also, MN Supreme Court ruled traffic ticket cameras unconstitutional.