A reader writes:

Silver's analysis looks sharp to me - and in ways that help Biden.  He's only repeating the opinion that he could rope in eastern PA.  More importantly, he's spot-on about seniors, most especially senior women.  For years, we've referred to him as Mom's Boyfriend Biden.  Contrary to some, she loves to listen to him talk - the humor but, most imporantly, he knows what he's talking about.  I'd even say, for all of Biden's infamous loquaciousness, he doesn't talk out of his butt.  Biden always does his homework. 

If Biden is named Obama's VP, I'll cry tears of joy.  If not, I'll just cry.