Here's something that unfortunately slipped through the cracks during Specter-mania on Tuesday: Sen. Kirsten GillibrandKirsten GillibrandThis Thanksgiving, skip the political food fights and talk UFOs instead Lobbying world Democrats optimistic as social spending bill heads to Senate MORE (N.Y.) may have another challenger in the 2010 Democratic primary.

Jon Cooper, a Suffolk County legislator, announced on Tuesday that he has created a exploratory committee for a Senate run, Crain's New York Business reports.

"I think Jon just wants to put his toe in the water and see if it's a viable option," Anthony Figliola, a spokesman for Cooper told Crain's.

Cooper joins a seemingly ever growing Democratic field. Manhattan Borough President Scott Stringer has also formed an exploratory committee and Reps. Steve Israel, Carolyn Maloney and Carolyn McCarthyCarolyn McCarthyWhy Congress needs an openly atheist member, now Lobbying World Lobbying world MORE are all looking at the race. Crain's also reports speculation that Rep. Jerrold Nadler is considering a run and Rep. Anthony Weiner could jump in, after recently all but abandoning his run for New York City mayor.

jeremy.jacobs@thehill.com