ABC News' Rick Klein reports: They're just a couple of former senators spending a Sunday visiting with old friends and colleagues. President Obama and Vice President Joe Biden arrived at the Capitol this afternoon to make the case for health care reform in person, in a meeting with members of the Senate Democratic caucus. "What's going on guys? Good to see you," the president said to the assembled press, ignoring a few questions about what he hoped to accomplish. Talk is swirling of a possible compromise on a public option; that and abortion remain as the two main sticking points to getting 60 Senate votes for health care reform. Also spotted going into the meeting with senators: Health and Human Services Secretary Kathleen Sebelius; Interior Secretary Ken Salazar (also a former senator); White House health care czar Nancy-Ann DeParle; and White House senior adviser David Axelrod. Not spotted going in: any Republicans. GOP senators were not invited to the meeting with the president, a fact they quickly turned into a political talking point on a Senate as they took (brief) control of a chamber where no Democrats were around. "I would say, on this Sunday, we’re available" to meet with the president, Sen. John McCain, R-Ariz., said on the Senate floor.