Sen. Chris MurphyChristopher (Chris) Scott MurphyFive things to know about Russia's troop buildup near Ukraine  Senate Democrat says he will 'settle' for less aggressive gun control reform 'because that will save lives' Ernst on Russian buildup on Ukraine border: 'We must prepare for the worst' MORE (D-Conn.), the senator behind a 15-hour filibuster last week pushing for votes on several gun control measures, said his talkathon "helped galvanize" the U.S. behind the issue. 

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"And so I'm still hopeful that we're going to be able to get votes. I know there are also some compromise negotiations happening that may bear fruit," Murphy said Sunday on ABC's "This Week." 

"But in the final analysis, what may be most important is that our filibuster helped galvanize an entire country around this issue," he said. 

Democrats are particularly focused on keeping individuals on federal terrorist watchlists from buying guns. They also favor background checks for more potential buyers.

But it's unlikely Democrats can get enough votes in a Republican-controlled Senate to pass the measures. 

"I admit that the background checks bill is going to be tough to get 60 votes on, but we still have hope that we can get Republicans to support the bill, stopping terrorists from getting weapons," Murphy said Sunday.