Anyone who sponsors a bill changing the law to define life as beginning at conception is stating exactly that, and they ought to be asked to explain themselves to their consituents. My guess is most will sound just as offensive as Akin and Mourdock if they're forced to give an off-the-cuff explanation.
Roughly half the GOP caucus co-sponsored the Life at Conception Act
To implement equal protection for the right to life of each born and preborn human person
Where "human person" is defined as
The terms `human person' and `human being' include each and every member of the species homo sapiens at all stages of life, including the moment of fertilization, cloning, or other moment at which an individual member of the human species comes into being.
This act does have an exception which would technically allow a woman to perform an abortion on herself without committing a crime (although it appears doctors or anyone else involved, doctor, could be charged with murder or accessory to murder).
However, no such exception exists for the Sanctity of Human Life Act which has 66 sponsors.
Notable members of Congress (sponsors of either bill) who believe rape pregnancies are a gift and are considered to be in potentially close races include
Todd Akin (of course), Roscoe Bartlett (MD-06), Joe Walsh (IL-08), Jeff Denham (CA-19), Allen West (FL-18), Dan Benishek (MI-01), Chip Cravaack (MN-08), Joseph Heck (NV-03), Jim Renacci (OH-16), Quico Canseco (TX-23), Daniel Webster (FL-10), Larry Buchson (IN-08), Steve King (IA-04), Michelle Bachmann (MN-06), Bill Johnson (OH-06), Sean Duffy (WI-07), Steve Southerland (FL-02), John Kline (MN-02), Bob Gibbs (OH-07), Kristi Noem (SD-AL), Scott DesJarlais (TN-04) [the guy who's pro-abortion when it comes to himself being in a sticky situation], Scott Rigell (VA-02), Reid Ribble (WI-08).