Reps. Joe Heck (R-Nev.) and Chris Gibson (R-N.Y.) were two of the 10 Republicans who defected on the Ryan budget, after the entire GOP conference was told to vote in favor of it.

The budget ultimately passed on a largely party-line vote. 

Soon after, the Democratic Congressional Campaign Committee issued a release targeting 70 GOP House members who DCCC spokeswoman Emily Bittner said "sided with millionaires and special interest corporations over the middle class" with their votes in favor of the budget.

House Majority PAC, a super PAC seeking to win back the Democratic majority in the House, also hit nine of its top 10 GOP targets with a release charging that the budget vote reveals how "extreme and out-of-touch" each lawmaker is. Heck is the 10th House Majority PAC target, and avoided both the DCCC and HMP releases, while Gibson avoided the DCCC release.

Heck is seeking reelection in a district that had a near-even split in the vote between President Obama and GOP presidential nominee Mitt Romney in 2012. Gibson is running in a district that favored Obama by six percentage points, making both their prospects in 2014 difficult.

Heck previously voted for a similar budget in 2012 and 2011. In a release explaining his vote against the budget, Heck sought to emphasize his independence, and his focus on Nevada.

"There is a dire need for us to reduce spending, address the major drivers of our debt, and grow the economy by balancing the budget. I have voted to reduce spending, I have voted to repeal and replace Obamacare, and I have co-sponsored and voted for a Balanced Budget Amendment. But the policy proposals contained in this non-binding resolution indicate the priorities of this budget, and when those proposals disproportionately affect our state, my vote indicates my priority and that priority is Nevada," he said.

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The Ryan budget became a centerpiece of the 2012 Democratic offense in the House. The DCCC sought to tie the budget — which they argue undermines Medicare while protecting millionaires — around the necks of vulnerable House Republicans. That year, Democrats posted a net gain of eight seats.

And Democrats have made it clear that they plan to launch the same attack this cycle. 

--This piece was updated at 5:04 p.m. to reflect House Majority PAC's attacks.