Paul Ryan was put on the ticket for a reason, to appease the GOP base, which is more conservative than it's ever been.
Ryan has backed more than one "forcible rape" (Akin's "legitimate rape") bill.
Ryan teamed with Akin on an anti-abortion bill. The only reason Akin (on the House Committee on Science, Space and Technology, if you can believe that) is getting so much grief from republicans is because it's an election year, and Akin could cost them control of the Senate.
See Paul Ryan's voting record here. It's not a side issue. It matters.
Ryan told Akin to quit: