Breaking News from The Politico:

Sen. Joseph Lieberman (Conn.), who was on the national Democratic ticket in 2000, will cross the aisle to endorse Sen. John McCain (R-Ariz.) tomorrow, Republican sources said. — Mike Allen

I’m not sure this has much of an impact on the ground – but – it signals that the senior (think Cabinet-worthy) folks are making moves and gestures toward each other. Yes, voters ultimately decide… but the resources spent by folks behind (and above) the scenes drive the message. Stay tuned. Things change fast and furious.

McCain also received editorial board endorsements from the Des Moines Register and The Boston Globe this weekend. (Hillary received the Des Moines Register nod for the Dems, and Obama for The Boston Globe.)

— Media Lizzy