Morning Joe 05/07/12

Santorum endorses Romney, but is Romney listening?

Politico Playbook: At around 11 p.m. EST on Monday, Rick Santorum endorsed Mitt Romney in an email to his supporters. It took Santorum 12 paragraphs to get to the endorsement, but he got there. Politico's Mike Allen discusses. ... more Duration: {{video.duration.momentjs}}