Susan Collins is a REPUBLICAN. And aside from perhaps possibly Olympia Snowe plus one Vietnamese/American legislator in the House, all Republicans are united in their opposition to what the Dems are proposing.
Now especially in light of what she said today, Susan Collins is VERY unlikely to break ranks and vote with the Dems.
At most, the Senate has a single GOP vote - Olympia Snowe's. And even that one will take some doing.