Joe Donnelly is a typical blue dog
The guy he was running against was from the stone age. No brainer there. Pick the far lesser of two evils.
I know next to nothing about Casey or his opponent Tom Smith. With Casey being a democrat I imagine his views are more in line with mine on a wide range of issues, even if not on abortion. I doubt Smith was to the left of Casey on abortion anyway, although it's possible I could be wrong.