Ray Duffy reports: "I was scouting Mill Creek Marsh for the Meadowlands Birding Festival on Saturday.  While passing the first fork along the paths, I came across a sparrow I am very confident was a Clay-colored Sparrow. 

"It was by a Song Sparrow and the color difference were very clear.  It had a well defined milar and a very obvious gray patch on the back of the neck.  It got flushed a number of times by joggers but kept in the area.  When I completed my loop it was in the same general area around 7:15 p.m.

Link to a pic is here. (Thanks, Ray!)