In many ways, Janet Mills is the ideal Democratic recruit to take on Republican Sen. Susan Collins, a fifth-term moderate with a track record of beating well-funded challengers. Mills is a two-term governor with a history of outperforming her party and a record of pushing back against President Donald Trump.

Maine Governor Janet Mills launched a U.S. Senate campaign on Tuesday, joining a crowded field of Democrats hoping to unseat Republican Senator Susan Collins with a campaign that intends to portray t...

Platner joins Morning Joe to discuss.