You can watch the debate live—all 20 hours of it, expected to run for a while longer today and continue tomorrow—on C-SPAN. Meanwhile, the GOP in attempting to derail the bill:

Republicans unveiled their strategy of introducing amendments that would be difficult for Democrats to vote against, raising the ire of the majority party. For instance, one of the nine amendments introduced by Sen. Tom Coburn (R-Okla.) is entitled "No Erectile Dysfunction Drugs To Sex Offenders." Sen. John McCain (R-Ariz.) ...

Meanwhile, as the reconciliation debate began yesterday, three different Senate committees were about to hold hearings: one on a national broadband plan, a hearing on federal financial management and an environmental hearing. All of those were abruptly canceled, however, because of GOP obstruction.

If the health-care bill is amended, it has to return to the House of Representatives.