Sen. Pat Toomey (R-Pa.), who championed a bipartisan compromise on gun reforms, has seen his approval rating reach new heights.

On the other, Sen. Kelly Ayotte (R-N.H.) has seen her support back home drop sharply, so much so that she is "underwater" (disapproval is higher than approval).

Yesterday, PPP came out with a poll showing that gun vote hurt others too:

After just 3 months in office Jeff Flake has already become one of the most unpopular Senators in the country. Just 32% of voters approve of him to 51% who disapprove and that -19 net approval rating makes him the most unpopular sitting Senator we've polled on, taking that label from Mitch McConnell.

***

When we polled Alaska in February Lisa Murkowski was one of the most popular Senators in the country with a 54% approval rating and only 33% of voters disapproving of her. She's seen a precipitous decline in the wake of her background checks vote though. Her approval is down a net 16 points from that +21 standing to +5 with 46% of voters approving and 41% now disapproving of her. Murkowski has lost most of her appeal to Democrats in the wake of her vote, with her numbers with them going from 59/25 to 44/44. And the vote hasn't increased her credibility with Republican either- she was at 51/38 with them in February and she's at 50/39 now.

Mark Begich is down following his no vote as well. He was at 49/39 in February and now he's at 41/37. His popularity has declined with Democrats (from 76/17 to 59/24) and with independents (from 54/32 to 43/35), and there has been no corresponding improvement with Republicans. He had a 24% approval rating with them two months ago and he has a 24% approval rating with them now.

***

We saw serious improvement in Rob Portman's poll numbers in the second half of 2012 following his consideration as the Republican Vice Presidential candidate, but he's taken a nose dive in 2013. Portman's approval has dropped a net 18 points over the last 6 months from +10 (35/25) in October to now -8 (26/34) in April. Portman's popularity decline has come across the board with Democrats (from 15/39 to 8/50), Republicans (62/11 to 46/19), and independents (28/23 to 24/32) alike.

***

And in Nevada Dean Heller has seen a more modest decline in his approval numbers, from 47/42 right before the election to 44/41 now. However with the independent voters who were critical to his narrow victory in November, his approval has dropped from 52/37 then to now 42/42.

Taken together these results make it pretty clear that this issue could be a serious liability for the Senators who opposed overwhelmingly popular background checks in the Senate vote earlier this month.

Let's hope the voter resentment stays until election day.