New York- Talk about piling on.

New Jersey Republicans and even some Democrats are howling for self-outed Gov. Jim McGreevey’s immediate resignation. And now the besieged politician is taking fire from none other than Carson Daly.

During a taping this week of the NBC late-night show “Last Call With Carson Daly” – for an episode scheduled to air Sept. 3 – the host held up a box of Wheaties featuring six-time Olympic gold medalist swimmer Michael Phelps.

Daly said, “And look what was right next to it on the shelf.”

Then he held up a box of something called “Gay Wheaties,” with a madly grinning McGreevey pictured on the front.

“Tastes just like Gay Cheerios,” Daly announced as he popped some in his mouth.

Funny?

There wasn’t a great deal of chuckling yesterday at McGreevey’s embattled press office.

“There’s a lot going on right now, and we’ve been having a lot of meetings, so I’m not sure if anyone will be able to get back to you,” a receptionist told Lowdown – and no one did.

But Steven Fisher, of the gay advocacy group Human Rights Campaign, quipped: “Carson should get to know gay people better. Cereal has way too many carbs.”