Looks like its support is splintering:
Without widespread corporate support, passage of the bill – already a long shot at best – becomes even more unlikely this year. President Bush remains opposed. House Democrats have been slow to act.
From CNN Money.
According to the WSJ even Hillary and McCain are likely to stay away from it. Voting to increase your local energy prices due to a flawed cap and trade carbon tax scheme which will create 5 new government bureaucracies is never a good thing for somebody trying to get elected.
Even with chances of passage dwindling, write your senator to tell them how you feel about it.