House Democrats’ campaign chief said the targeting of Republicans who voted for the Paul Ryan budget plan will help his party win back two key constituencies it lost in 2010: seniors and independents.

In a recent campaign of robocalls and radio and TV ads, Democrats have hit Republicans for voting for House Budget Committee Chairman Paul Ryan's (R-Wis.) plan to “eliminate” Medicare.

"They have put back into play two critical groups of the electorate: seniors and independents," Rep. Steve Israel (D-N.Y.), chairman of the Democratic Congressional Campaign Committee (DCCC), told MSNBC Monday night. "Look, the bottom line is that we lost seniors in 2010 and we lost about 9 million independents in 2010. Now, we lost them because Republicans were effectively able to lie about us on Medicare.

"All we have to do to get them back is tell the truth about wanting to end Medicare and that's precisely what we're doing now and what we're going to continue to do every day," Israel said.

The media blitz is a coordinated effort by Democrats and liberal groups. On Monday night, the DCCC upped the number of targeted districts from 25 to 42. The liberal group Americans United for Change has also released a television ad strongly criticizing four Republicans for voting for the Ryan plan.

The effort comes only a few days after Democrats highlighted a recent town-hall meeting hosted by Ryan where he received boos after being questioned on his plan’s extension of tax cuts for the wealthy.

Democrats have said recent town-hall events like that have emboldened them.

"At town halls across the country and in recent national polling, it’s clear that House Republicans bit off more than they could chew when they voted to end Medicare and raise healthcare costs for seniors. Even Paul Ryan himself is holing up in his own district trying to defend this plan to his own constituents, and it’s not working," a Democratic strategist told The Hill on Monday.