A number of news outlets are reporting via Twitter that Rick Santorum has dropped out of the presidential race. Santorum was supposed to return to the campaign trail today, after his three-year-old daughter was released from the hospital last night, where she was being treated for a developmental condition — but we don't know what, if anything, that has to do with his exit. More as we know it.

2:20 EST:

Two of Santorum's advisers confirmed to the New York Times that he's suspending his campaign, "bowing to the inevitability of Mitt Romney's nomination and ending his improbable, come-from-behind quest to become the party's conservative standard-bearer in the fall."

2:50 EST:

Watch Santorum's resignation, which was livestreamed via Politico, up above.

He called his race miraculous: "Miracle after miracle, this race was as improbable as any race you'll see for President," compared himself to Abraham Lincoln, gave the Duggars a shout out, and said it was "fun" when his sweater vests went viral. He vowed to continue the fight to beat Obama, but did not endorse Mitt Romney.