That's Rep. Allyson Schwartz (D-PA), who's now running in a competitive primary for Pennsylvania governor, and running hard on her support for the Affordable Care Act and—crucially—Medicaid expansion.
"I worked with President Obama on the Affordable Care Act and getting health coverage to all Americans. […] It was my legislation that said insurance companies can no longer deny coverage for kids with pre-existing conditions. It’s something I’m proud of because it also closed the gap in prescription drug coverage for seniors. […] Tom Corbett has decided not to take the Medicaid money. As governor, I will take the Medicaid expansion, because 500,000 Pennsylvanians need health coverage.Writing here at Daily Kos, Schwartz says: "The law is working; it has already provided coverage to over 8 million Americans! But when the President says that coverage of millions of others is within our immediate reach, he is right."
Standing with Obama should definitely be a plus in the Democratic primary, the audience Schwartz is aiming at with this ad which is running in the Philadelphia and Pittsburgh markets. But she wouldn't be running it if she was worried that it could backfire in the general election.
It shouldn't backfire in November, and largely because 500,000 people fall into the Medicaid gap there. Standing up for them, and for all the people in Pennsylvania who've gained insurance because of Obamacare, is smart politics.