As I write this, Rick Santorum and Bob Casey are debating live on KYW-AM Radio. You can link up via the KYW site.
To summarize the debate so far:
Santorum is accusing Casey of not working hard enough and Casey is criticizing Santorum for working too hard for the wrong causes.
The debate is a low-keyed version of their slugfest in Pittsburgh last wee.
The two will debate again tonight at 7 p.m. on WPVI-TV (Channel 6), with a rebroadcast on PCN at 8 p.m. and 10 p.m.