(CNN) - President Barack Obama assured Democrats that maintaining control of the Senate is his top priority this year, according to sources present at a meeting between the President and Senate Democrats on Wednesday.
Continuing outreach to members of his party ahead of this year's midterm elections, Obama, along with former President Bill Clinton, attended the Senate Democrats' issues conference at the Washington National's Park.
With a number of vulnerable Democratic senators up for re-election this year, sources in the room said the President vowed to do what he can to support Democratic candidates. Keeping the Senate under Democratic control is key to furthering the White House's second-term agenda.
The Democratic caucus currently holds a 55-45 majority in the 100-member chamber, but 21 Democratic-controlled seats are up this year as opposed to only 15 Republican seats. Making matters worse for Democrats is the consensus view that the overwhelming majority of vulnerable seats are currently held by Democrats.
The meeting served as a question-and-answer opportunity between Senate Democrats and the President. Some Democrats up for re-election asked Obama questions, but they focused on substantive topics, largely avoiding politics, according to the source.
"There was amazingly little politics, virtually no politics," said this source, who called the meeting "positive" and not "defensive" on anyone's part.
Another source in the room said topics ranged from the Affordable Care Act, to immigration, to unemployment benefits, to flood insurance, to trade, to veteran's issues, to housing and finance reform and even the practical effects of climate change, noting specifically the current drought in California.
Obama was introduced by New Hampshire Sen. Jeanne Shaheen, a vulnerable Democrat who is up for reelection and whose seat Republicans see as in play in November.
Sources in the room said Louisiana Sen. Mary Landrieu, another vulnerable Democrat up for reelection in this year, thanked him for his help on her flood insurance bill, and asked that he helped continue to push it through.
A source said the President discussed the Affordable Care Act, which has been a source of discomfort for Democrats hoping to steer clear of some negative perceptions of the law. The source said the President's message was that more than 10 million people have insurance that wouldn't have before.
The Congressional Budget Office report released Tuesday on the effects of Obama's health care law, was also discussed, according to one source.
Republicans have used the report as the latest attack line against the White House, latching on to the statistic that the number of full-time employees will drop by 2 million due to the ACA. The source said that Obama pushed back on this representation and promised continued counterarguments.
Obama also met with House Democrats on Tuesday at the White House and will attend their retreat next week.
In a lighter moment at the meeting, New Mexico Sen. Martin Heinrich's young son, who was there because his school was closed Wednesday, came to the stage. The President asked the little boy if the meeting was interesting or boring. The senator's son said "kinda boring" – to which the President joked that Heinrich's son is already "speaking truth to power."
CNN's Dana Davidsen contributed to this report.