So much for momentum from the CBO report this morning. New York Democrat Michael Arcuri announced earlier today to his colleagues that he would not vote for the House reconciliation package on ObamaCare, essentially negating the flip from Dennis Kucinich yesterday:

Rep. Michael Arcuri (D-NY), a sophomore Dem who had a tougher-than-expected re-election bid in ’08, has told the Dem caucus he will vote against the bill. …

Arcuri’s vote will not hurt the bill’s chances in committee, where Dems hold a 9-4 advantage over GOPers. The panel’s other 8 Dems all voted for the first version of health care, and only Rep. Dennis Cardoza (D-CA) voted in favor of the Stupak amendment.

But Arcuri’s decision could make Speaker Nancy Pelosi’s goal of winning the 216 votes necessary for passage all the more difficult. Sources say Dems remain short of the votes necessary for passage, but that they have not reached their goal yet.

Arcuri becomes the first Democrat on the Rules committee to push back against the Slaughter strategy. That puts the split at 8-5. If Cardoza flips on the committee vote, it then becomes a 7-6 vote — and things may get a little dicey for Nancy Pelosi and Louise Slaughter.

More importantly, Arcuri’s flip shows that process does matter, or at least that some Democrats think it does. If the Slaughter strategy goes forward, there may be more Democrats who will blanch at voting to support it.