U2 lead singer Bono was in the Senate Tuesday, conducting drop-in visits with senators to lobby for the ONE Campaign he co-founded in 2004.

The Irishman came equipped with his trademark tinted sunglasses, a small earring, a dark suit and a message.

"I'm here to listen today, not speak," he told The Hill. "I'm just here selling my wares as usual. The ONE Campaign is at the top of the list."

The ONE Campaign numbers 2.4 million fans and is a non-partisan, non-profit advocacy group dedicated to fighting poverty and disease in lower-income countries. Last year the group organized an advocacy
campaign around the presidential election that was co-chaired by former Senate majority leader Bill Frist (R-Tenn.) and Tom Daschle.

In the Senate subway, Bono shared a particularly warm embrace and conversation with Sen. Dianne FeinsteinDianne FeinsteinThis week: Congress returns to government shutdown fight Hotel industry details plans to fight Airbnb Congress needs a do-over on fraud-laden 'Immigrant Investor' program MORE (D-Calif.).

- J. Taylor Rushing