ARKANSAS: Pryor (D) and Lincoln (D)A number of the Republicans on this list are probably skeptical about some of the health-care nationalization message (Snowe and Collins are probably perceived as the Republican senators most open to Obama's vision for health-care reform), and a lot of the Democrats, like Bill Nelson, are concerned about the costs of this health-care measure and also about its implications for the private market.
INDIANA: Lugar(R) and Bayh (D)
FLORIDA: Nelson (D) and Martinez (R)
LOUISIANA: Landreiu (D) and Vitter (R)
MAINE: Snowe (R) and Collins (R)
NORTH DAKOTA: Conrad (D) and Dorgan (D)
NEBRASKA: Nelson (D) and Johanns (R)
OHIO: Voinovich (R) and Brown (D)
Obama's organizing machine is also creating "house parties" in many of these states. His forces are beginning to increase the pressure---and trying to drum up workers for $11-16 an hour.
The Democrats listed above aren't the only possible Democratic skeptics "Obamacare" may be facing in the Senate (Joe Lieberman, for example, has voiced some doubts about the "public plan"), but it does seem as though the White House is concerned about them.
In the days ahead, we'll no doubt see more of where the undecided votes stand. Skeptics of this flavor of reform could do worse than contacting some of these undecided members of Congress, both in the House and in the Senate.