@CNN: By the time GOP Sen. Susan Collins finished her speech on the Senate floor, Democrats in Maine had begun speculating who might challenge her. And progressive activists are pouring in money to fund the eventual challenger https://t.co/OntvxVnfAR https://t.co/3l5eAjfztg

@CNN: By the time GOP Sen. Susan Collins finished her speech on the Senate floor, Democrats in Maine had begun speculating who might challenge her. And progressive activists are pouring in money to fund the eventual challenger https://t.co/OntvxVnfAR https://t.co/3l5eAjfztg